Mercurial > hg
annotate contrib/python-zstandard/NEWS.rst @ 43084:c2e284cee333
import-checker: allow symbol imports from mercurial.pycompat
Currently, the source transformer inserts
`from mercurial.pycompat import delattr, getattr, hasattr, setattr, open, unicode`
to the top of every file. As part of getting rid of the source transformer,
we'll need to have source code call these wrappers directly. Rather than
rewrite all call sites to call pycompat.*, I think it makes sense to import
needed symbols via explicit imports. That requires loosening the import checker
to allow this.
Differential Revision: https://phab.mercurial-scm.org/D7004
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sun, 06 Oct 2019 13:17:19 -0400 |
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1 =============== |
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2 Version History |
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3 =============== |
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4 |
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5 1.0.0 (not yet released) |
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6 ======================== |
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7 |
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8 Actions Blocking Release |
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9 ------------------------ |
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10 |
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11 * compression and decompression APIs that support ``io.RawIOBase`` interface |
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12 (#13). |
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13 * ``stream_writer()`` APIs should support ``io.RawIOBase`` interface. |
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14 * Properly handle non-blocking I/O and partial writes for objects implementing |
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15 ``io.RawIOBase``. |
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16 * Make ``write_return_read=True`` the default for objects implementing |
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17 ``io.RawIOBase``. |
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18 * Audit for consistent and proper behavior of ``flush()`` and ``close()`` for |
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19 all objects implementing ``io.RawIOBase``. Is calling ``close()`` on |
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20 wrapped stream acceptable, should ``__exit__`` always call ``close()``, |
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21 should ``close()`` imply ``flush()``, etc. |
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22 * Consider making reads across frames configurable behavior. |
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23 * Refactor module names so C and CFFI extensions live under ``zstandard`` |
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24 package. |
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25 * Overall API design review. |
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26 * Use Python allocator where possible. |
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27 * Figure out what to do about experimental APIs not implemented by CFFI. |
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28 * APIs for auto adjusting compression parameters based on input size. e.g. |
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29 clamping the window log so it isn't too large for input. |
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30 * Consider allowing compressor and decompressor instances to be thread safe, |
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31 support concurrent operations. Or track when an operation is in progress and |
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32 refuse to let concurrent operations use the same instance. |
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33 * Support for magic-less frames for all decompression operations (``decompress()`` |
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34 doesn't work due to sniffing the content size and the lack of a ZSTD API to |
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35 sniff magic-less frames - this should be fixed in 1.3.5.). |
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36 * Audit for complete flushing when ending compression streams. |
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37 * Deprecate legacy APIs. |
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38 * Audit for ability to control read/write sizes on all APIs. |
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39 * Detect memory leaks via bench.py. |
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40 * Remove low-level compression parameters from ``ZstdCompressor.__init__`` and |
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41 require use of ``CompressionParameters``. |
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42 * Expose ``ZSTD_getFrameProgression()`` from more compressor types. |
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43 * Support modifying compression parameters mid operation when supported by |
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44 zstd API. |
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45 * Expose ``ZSTD_CLEVEL_DEFAULT`` constant. |
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46 * Support ``ZSTD_p_forceAttachDict`` compression parameter. |
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47 * Support ``ZSTD_c_literalCompressionMode `` compression parameter. |
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48 * Use ``ZSTD_CCtx_getParameter()``/``ZSTD_CCtxParam_getParameter()`` for retrieving |
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49 compression parameters. |
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50 * Consider exposing ``ZSTDMT_toFlushNow()``. |
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51 * Expose ``ZDICT_trainFromBuffer_fastCover()``, |
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52 ``ZDICT_optimizeTrainFromBuffer_fastCover``. |
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53 * Expose and enforce ``ZSTD_minCLevel()`` for minimum compression level. |
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54 * Consider a ``chunker()`` API for decompression. |
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55 * Consider stats for ``chunker()`` API, including finding the last consumed |
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56 offset of input data. |
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57 * Consider exposing ``ZSTD_cParam_getBounds()`` and |
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58 ``ZSTD_dParam_getBounds()`` APIs. |
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59 * Consider controls over resetting compression contexts (session only, parameters, |
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60 or session and parameters). |
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61 * Actually use the CFFI backend in fuzzing tests. |
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62 |
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63 Other Actions Not Blocking Release |
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64 --------------------------------------- |
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65 |
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66 * Support for block compression APIs. |
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67 * API for ensuring max memory ceiling isn't exceeded. |
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68 * Move off nose for testing. |
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69 |
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70 0.12.0 (released 2019-09-15) |
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71 ============================ |
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72 |
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73 Backwards Compatibility Notes |
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74 ----------------------------- |
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75 |
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76 * Support for Python 3.4 has been dropped since Python 3.4 is no longer |
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77 a supported Python version upstream. (But it will likely continue to |
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78 work until Python 2.7 support is dropped and we port to Python 3.5+ |
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79 APIs.) |
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80 |
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81 Bug Fixes |
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82 --------- |
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83 |
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84 * Fix ``ZstdDecompressor.__init__`` on 64-bit big-endian systems (#91). |
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85 * Fix memory leak in ``ZstdDecompressionReader.seek()`` (#82). |
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86 |
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87 Changes |
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88 ------- |
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89 |
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90 * CI transitioned to Azure Pipelines (from AppVeyor and Travis CI). |
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91 * Switched to ``pytest`` for running tests (from ``nose``). |
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92 * Bundled zstandard library upgraded from 1.3.8 to 1.4.3. |
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93 |
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94 0.11.1 (released 2019-05-14) |
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95 ============================ |
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96 |
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97 * Fix memory leak in ``ZstdDecompressionReader.seek()`` (#82). |
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98 |
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99 0.11.0 (released 2019-02-24) |
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100 ============================ |
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101 |
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102 Backwards Compatibility Notes |
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103 ----------------------------- |
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104 |
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105 * ``ZstdDecompressor.read()`` now allows reading sizes of ``-1`` or ``0`` |
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106 and defaults to ``-1``, per the documented behavior of |
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107 ``io.RawIOBase.read()``. Previously, we required an argument that was |
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108 a positive value. |
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109 * The ``readline()``, ``readlines()``, ``__iter__``, and ``__next__`` methods |
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110 of ``ZstdDecompressionReader()`` now raise ``io.UnsupportedOperation`` |
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111 instead of ``NotImplementedError``. |
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112 * ``ZstdDecompressor.stream_reader()`` now accepts a ``read_across_frames`` |
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113 argument. The default value will likely be changed in a future release |
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114 and consumers are advised to pass the argument to avoid unwanted change |
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115 of behavior in the future. |
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116 * ``setup.py`` now always disables the CFFI backend if the installed |
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117 CFFI package does not meet the minimum version requirements. Before, it was |
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118 possible for the CFFI backend to be generated and a run-time error to |
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119 occur. |
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120 * In the CFFI backend, ``CompressionReader`` and ``DecompressionReader`` |
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121 were renamed to ``ZstdCompressionReader`` and ``ZstdDecompressionReader``, |
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122 respectively so naming is identical to the C extension. This should have |
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123 no meaningful end-user impact, as instances aren't meant to be |
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124 constructed directly. |
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125 * ``ZstdDecompressor.stream_writer()`` now accepts a ``write_return_read`` |
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126 argument to control whether ``write()`` returns the number of bytes |
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127 read from the source / written to the decompressor. It defaults to off, |
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128 which preserves the existing behavior of returning the number of bytes |
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129 emitted from the decompressor. The default will change in a future release |
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130 so behavior aligns with the specified behavior of ``io.RawIOBase``. |
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131 * ``ZstdDecompressionWriter.__exit__`` now calls ``self.close()``. This |
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132 will result in that stream plus the underlying stream being closed as |
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133 well. If this behavior is not desirable, do not use instances as |
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134 context managers. |
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135 * ``ZstdCompressor.stream_writer()`` now accepts a ``write_return_read`` |
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136 argument to control whether ``write()`` returns the number of bytes read |
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137 from the source / written to the compressor. It defaults to off, which |
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138 preserves the existing behavior of returning the number of bytes emitted |
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139 from the compressor. The default will change in a future release so |
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140 behavior aligns with the specified behavior of ``io.RawIOBase``. |
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141 * ``ZstdCompressionWriter.__exit__`` now calls ``self.close()``. This will |
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142 result in that stream plus any underlying stream being closed as well. If |
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143 this behavior is not desirable, do not use instances as context managers. |
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144 * ``ZstdDecompressionWriter`` no longer requires being used as a context |
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145 manager (#57). |
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146 * ``ZstdCompressionWriter`` no longer requires being used as a context |
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147 manager (#57). |
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148 * The ``overlap_size_log`` attribute on ``CompressionParameters`` instances |
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149 has been deprecated and will be removed in a future release. The |
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150 ``overlap_log`` attribute should be used instead. |
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151 * The ``overlap_size_log`` argument to ``CompressionParameters`` has been |
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152 deprecated and will be removed in a future release. The ``overlap_log`` |
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153 argument should be used instead. |
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154 * The ``ldm_hash_every_log`` attribute on ``CompressionParameters`` instances |
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155 has been deprecated and will be removed in a future release. The |
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156 ``ldm_hash_rate_log`` attribute should be used instead. |
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157 * The ``ldm_hash_every_log`` argument to ``CompressionParameters`` has been |
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158 deprecated and will be removed in a future release. The ``ldm_hash_rate_log`` |
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159 argument should be used instead. |
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160 * The ``compression_strategy`` argument to ``CompressionParameters`` has been |
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161 deprecated and will be removed in a future release. The ``strategy`` |
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162 argument should be used instead. |
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163 * The ``SEARCHLENGTH_MIN`` and ``SEARCHLENGTH_MAX`` constants are deprecated |
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164 and will be removed in a future release. Use ``MINMATCH_MIN`` and |
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165 ``MINMATCH_MAX`` instead. |
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166 * The ``zstd_cffi`` module has been renamed to ``zstandard.cffi``. As had |
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167 been documented in the ``README`` file since the ``0.9.0`` release, the |
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168 module should not be imported directly at its new location. Instead, |
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169 ``import zstandard`` to cause an appropriate backend module to be loaded |
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170 automatically. |
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171 |
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172 Bug Fixes |
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173 --------- |
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174 |
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175 * CFFI backend could encounter a failure when sending an empty chunk into |
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176 ``ZstdDecompressionObj.decompress()``. The issue has been fixed. |
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177 * CFFI backend could encounter an error when calling |
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178 ``ZstdDecompressionReader.read()`` if there was data remaining in an |
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179 internal buffer. The issue has been fixed. (#71) |
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180 |
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181 Changes |
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182 ------- |
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183 |
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184 * ``ZstDecompressionObj.decompress()`` now properly handles empty inputs in |
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185 the CFFI backend. |
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186 * ``ZstdCompressionReader`` now implements ``read1()`` and ``readinto1()``. |
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187 These are part of the ``io.BufferedIOBase`` interface. |
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188 * ``ZstdCompressionReader`` has gained a ``readinto(b)`` method for reading |
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189 compressed output into an existing buffer. |
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190 * ``ZstdCompressionReader.read()`` now defaults to ``size=-1`` and accepts |
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191 read sizes of ``-1`` and ``0``. The new behavior aligns with the documented |
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192 behavior of ``io.RawIOBase``. |
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193 * ``ZstdCompressionReader`` now implements ``readall()``. Previously, this |
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194 method raised ``NotImplementedError``. |
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195 * ``ZstdDecompressionReader`` now implements ``read1()`` and ``readinto1()``. |
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196 These are part of the ``io.BufferedIOBase`` interface. |
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197 * ``ZstdDecompressionReader.read()`` now defaults to ``size=-1`` and accepts |
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198 read sizes of ``-1`` and ``0``. The new behavior aligns with the documented |
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199 behavior of ``io.RawIOBase``. |
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200 * ``ZstdDecompressionReader()`` now implements ``readall()``. Previously, this |
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201 method raised ``NotImplementedError``. |
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202 * The ``readline()``, ``readlines()``, ``__iter__``, and ``__next__`` methods |
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203 of ``ZstdDecompressionReader()`` now raise ``io.UnsupportedOperation`` |
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204 instead of ``NotImplementedError``. This reflects a decision to never |
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205 implement text-based I/O on (de)compressors and keep the low-level API |
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206 operating in the binary domain. (#13) |
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207 * ``README.rst`` now documented how to achieve linewise iteration using |
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208 an ``io.TextIOWrapper`` with a ``ZstdDecompressionReader``. |
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209 * ``ZstdDecompressionReader`` has gained a ``readinto(b)`` method for |
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210 reading decompressed output into an existing buffer. This allows chaining |
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211 to an ``io.TextIOWrapper`` on Python 3 without using an ``io.BufferedReader``. |
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212 * ``ZstdDecompressor.stream_reader()`` now accepts a ``read_across_frames`` |
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213 argument to control behavior when the input data has multiple zstd |
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214 *frames*. When ``False`` (the default for backwards compatibility), a |
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215 ``read()`` will stop when the end of a zstd *frame* is encountered. When |
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216 ``True``, ``read()`` can potentially return data spanning multiple zstd |
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217 *frames*. The default will likely be changed to ``True`` in a future |
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218 release. |
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219 * ``setup.py`` now performs CFFI version sniffing and disables the CFFI |
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220 backend if CFFI is too old. Previously, we only used ``install_requires`` |
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221 to enforce the CFFI version and not all build modes would properly enforce |
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222 the minimum CFFI version. (#69) |
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223 * CFFI's ``ZstdDecompressionReader.read()`` now properly handles data |
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224 remaining in any internal buffer. Before, repeated ``read()`` could |
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225 result in *random* errors. (#71) |
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226 * Upgraded various Python packages in CI environment. |
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227 * Upgrade to hypothesis 4.5.11. |
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228 * In the CFFI backend, ``CompressionReader`` and ``DecompressionReader`` |
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229 were renamed to ``ZstdCompressionReader`` and ``ZstdDecompressionReader``, |
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230 respectively. |
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231 * ``ZstdDecompressor.stream_writer()`` now accepts a ``write_return_read`` |
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232 argument to control whether ``write()`` returns the number of bytes read |
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233 from the source. It defaults to ``False`` to preserve backwards |
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234 compatibility. |
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235 * ``ZstdDecompressor.stream_writer()`` now implements the ``io.RawIOBase`` |
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236 interface and behaves as a proper stream object. |
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237 * ``ZstdCompressor.stream_writer()`` now accepts a ``write_return_read`` |
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238 argument to control whether ``write()`` returns the number of bytes read |
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239 from the source. It defaults to ``False`` to preserve backwards |
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240 compatibility. |
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241 * ``ZstdCompressionWriter`` now implements the ``io.RawIOBase`` interface and |
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242 behaves as a proper stream object. ``close()`` will now close the stream |
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243 and the underlying stream (if possible). ``__exit__`` will now call |
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244 ``close()``. Methods like ``writable()`` and ``fileno()`` are implemented. |
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245 * ``ZstdDecompressionWriter`` no longer must be used as a context manager. |
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246 * ``ZstdCompressionWriter`` no longer must be used as a context manager. |
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247 When not using as a context manager, it is important to call |
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248 ``flush(FRAME_FRAME)`` or the compression stream won't be properly |
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249 terminated and decoders may complain about malformed input. |
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250 * ``ZstdCompressionWriter.flush()`` (what is returned from |
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251 ``ZstdCompressor.stream_writer()``) now accepts an argument controlling the |
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252 flush behavior. Its value can be one of the new constants |
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253 ``FLUSH_BLOCK`` or ``FLUSH_FRAME``. |
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254 * ``ZstdDecompressionObj`` instances now have a ``flush([length=None])`` method. |
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255 This provides parity with standard library equivalent types. (#65) |
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256 * ``CompressionParameters`` no longer redundantly store individual compression |
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257 parameters on each instance. Instead, compression parameters are stored inside |
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258 the underlying ``ZSTD_CCtx_params`` instance. Attributes for obtaining |
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259 parameters are now properties rather than instance variables. |
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260 * Exposed the ``STRATEGY_BTULTRA2`` constant. |
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261 * ``CompressionParameters`` instances now expose an ``overlap_log`` attribute. |
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262 This behaves identically to the ``overlap_size_log`` attribute. |
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263 * ``CompressionParameters()`` now accepts an ``overlap_log`` argument that |
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264 behaves identically to the ``overlap_size_log`` argument. An error will be |
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265 raised if both arguments are specified. |
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266 * ``CompressionParameters`` instances now expose an ``ldm_hash_rate_log`` |
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267 attribute. This behaves identically to the ``ldm_hash_every_log`` attribute. |
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268 * ``CompressionParameters()`` now accepts a ``ldm_hash_rate_log`` argument that |
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269 behaves identically to the ``ldm_hash_every_log`` argument. An error will be |
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270 raised if both arguments are specified. |
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271 * ``CompressionParameters()`` now accepts a ``strategy`` argument that behaves |
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272 identically to the ``compression_strategy`` argument. An error will be raised |
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273 if both arguments are specified. |
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274 * The ``MINMATCH_MIN`` and ``MINMATCH_MAX`` constants were added. They are |
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275 semantically equivalent to the old ``SEARCHLENGTH_MIN`` and |
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276 ``SEARCHLENGTH_MAX`` constants. |
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277 * Bundled zstandard library upgraded from 1.3.7 to 1.3.8. |
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278 * ``setup.py`` denotes support for Python 3.7 (Python 3.7 was supported and |
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279 tested in the 0.10 release). |
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280 * ``zstd_cffi`` module has been renamed to ``zstandard.cffi``. |
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281 * ``ZstdCompressor.stream_writer()`` now reuses a buffer in order to avoid |
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282 allocating a new buffer for every operation. This should result in faster |
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283 performance in cases where ``write()`` or ``flush()`` are being called |
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284 frequently. (#62) |
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285 * Bundled zstandard library upgraded from 1.3.6 to 1.3.7. |
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286 |
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287 0.10.2 (released 2018-11-03) |
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288 ============================ |
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289 |
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290 Bug Fixes |
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291 --------- |
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292 |
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293 * ``zstd_cffi.py`` added to ``setup.py`` (#60). |
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294 |
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295 Changes |
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296 ------- |
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297 |
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298 * Change some integer casts to avoid ``ssize_t`` (#61). |
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299 |
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300 0.10.1 (released 2018-10-08) |
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301 ============================ |
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302 |
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303 Backwards Compatibility Notes |
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304 ----------------------------- |
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305 |
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306 * ``ZstdCompressor.stream_reader().closed`` is now a property instead of a |
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307 method (#58). |
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308 * ``ZstdDecompressor.stream_reader().closed`` is now a property instead of a |
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309 method (#58). |
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310 |
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311 Changes |
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312 ------- |
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313 |
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314 * Stop attempting to package Python 3.6 for Miniconda. The latest version of |
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315 Miniconda is using Python 3.7. The Python 3.6 Miniconda packages were a lie |
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316 since this were built against Python 3.7. |
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317 * ``ZstdCompressor.stream_reader()``'s and ``ZstdDecompressor.stream_reader()``'s |
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318 ``closed`` attribute is now a read-only property instead of a method. This now |
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319 properly matches the ``IOBase`` API and allows instances to be used in more |
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320 places that accept ``IOBase`` instances. |
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321 |
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322 0.10.0 (released 2018-10-08) |
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323 ============================ |
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324 |
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325 Backwards Compatibility Notes |
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326 ----------------------------- |
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327 |
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328 * ``ZstdDecompressor.stream_reader().read()`` now consistently requires an |
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329 argument in both the C and CFFI backends. Before, the CFFI implementation |
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330 would assume a default value of ``-1``, which was later rejected. |
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331 * The ``compress_literals`` argument and attribute has been removed from |
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332 ``zstd.ZstdCompressionParameters`` because it was removed by the zstd 1.3.5 |
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333 API. |
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334 * ``ZSTD_CCtx_setParametersUsingCCtxParams()`` is no longer called on every |
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335 operation performed against ``ZstdCompressor`` instances. The reason for this |
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336 change is that the zstd 1.3.5 API no longer allows this without calling |
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337 ``ZSTD_CCtx_resetParameters()`` first. But if we called |
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338 ``ZSTD_CCtx_resetParameters()`` on every operation, we'd have to redo |
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339 potentially expensive setup when using dictionaries. We now call |
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340 ``ZSTD_CCtx_reset()`` on every operation and don't attempt to change |
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341 compression parameters. |
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342 * Objects returned by ``ZstdCompressor.stream_reader()`` no longer need to be |
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343 used as a context manager. The context manager interface still exists and its |
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344 behavior is unchanged. |
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345 * Objects returned by ``ZstdDecompressor.stream_reader()`` no longer need to be |
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346 used as a context manager. The context manager interface still exists and its |
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347 behavior is unchanged. |
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348 |
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349 Bug Fixes |
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350 --------- |
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351 |
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352 * ``ZstdDecompressor.decompressobj().decompress()`` should now return all data |
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353 from internal buffers in more scenarios. Before, it was possible for data to |
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354 remain in internal buffers. This data would be emitted on a subsequent call |
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355 to ``decompress()``. The overall output stream would still be valid. But if |
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356 callers were expecting input data to exactly map to output data (say the |
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357 producer had used ``flush(COMPRESSOBJ_FLUSH_BLOCK)`` and was attempting to |
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358 map input chunks to output chunks), then the previous behavior would be |
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359 wrong. The new behavior is such that output from |
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360 ``flush(COMPRESSOBJ_FLUSH_BLOCK)`` fed into ``decompressobj().decompress()`` |
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361 should produce all available compressed input. |
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362 * ``ZstdDecompressor.stream_reader().read()`` should no longer segfault after |
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363 a previous context manager resulted in error (#56). |
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364 * ``ZstdCompressor.compressobj().flush(COMPRESSOBJ_FLUSH_BLOCK)`` now returns |
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365 all data necessary to flush a block. Before, it was possible for the |
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366 ``flush()`` to not emit all data necessary to fully represent a block. This |
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367 would mean decompressors wouldn't be able to decompress all data that had been |
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368 fed into the compressor and ``flush()``ed. (#55). |
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369 |
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370 New Features |
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371 ------------ |
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372 |
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373 * New module constants ``BLOCKSIZELOG_MAX``, ``BLOCKSIZE_MAX``, |
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374 ``TARGETLENGTH_MAX`` that expose constants from libzstd. |
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375 * New ``ZstdCompressor.chunker()`` API for manually feeding data into a |
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376 compressor and emitting chunks of a fixed size. Like ``compressobj()``, the |
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377 API doesn't impose restrictions on the input or output types for the |
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378 data streams. Unlike ``compressobj()``, it ensures output chunks are of a |
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379 fixed size. This makes this API useful when the compressed output is being |
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380 fed into an I/O layer, where uniform write sizes are useful. |
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381 * ``ZstdCompressor.stream_reader()`` no longer needs to be used as a context |
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382 manager (#34). |
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383 * ``ZstdDecompressor.stream_reader()`` no longer needs to be used as a context |
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384 manager (#34). |
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385 * Bundled zstandard library upgraded from 1.3.4 to 1.3.6. |
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386 |
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387 Changes |
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388 ------- |
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389 |
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390 * Added ``zstd_cffi.py`` and ``NEWS.rst`` to ``MANIFEST.in``. |
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391 * ``zstandard.__version__`` is now defined (#50). |
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392 * Upgrade pip, setuptools, wheel, and cibuildwheel packages to latest versions. |
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393 * Upgrade various packages used in CI to latest versions. Notably tox (in |
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394 order to support Python 3.7). |
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395 * Use relative paths in setup.py to appease Python 3.7 (#51). |
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396 * Added CI for Python 3.7. |
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397 |
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398 0.9.1 (released 2018-06-04) |
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399 =========================== |
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400 |
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401 * Debian packaging support. |
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402 * Fix typo in setup.py (#44). |
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403 * Support building with mingw compiler (#46). |
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404 |
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405 0.9.0 (released 2018-04-08) |
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406 =========================== |
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407 |
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408 Backwards Compatibility Notes |
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409 ----------------------------- |
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410 |
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411 * CFFI 1.11 or newer is now required (previous requirement was 1.8). |
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412 * The primary module is now ``zstandard``. Please change imports of ``zstd`` |
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413 and ``zstd_cffi`` to ``import zstandard``. See the README for more. Support |
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414 for importing the old names will be dropped in the next release. |
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415 * ``ZstdCompressor.read_from()`` and ``ZstdDecompressor.read_from()`` have |
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416 been renamed to ``read_to_iter()``. ``read_from()`` is aliased to the new |
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417 name and will be deleted in a future release. |
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418 * Support for Python 2.6 has been removed. |
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419 * Support for Python 3.3 has been removed. |
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420 * The ``selectivity`` argument to ``train_dictionary()`` has been removed, as |
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421 the feature disappeared from zstd 1.3. |
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422 * Support for legacy dictionaries has been removed. Cover dictionaries are now |
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423 the default. ``train_cover_dictionary()`` has effectively been renamed to |
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424 ``train_dictionary()``. |
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425 * The ``allow_empty`` argument from ``ZstdCompressor.compress()`` has been |
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426 deleted and the method now allows empty inputs to be compressed by default. |
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427 * ``estimate_compression_context_size()`` has been removed. Use |
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428 ``CompressionParameters.estimated_compression_context_size()`` instead. |
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429 * ``get_compression_parameters()`` has been removed. Use |
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430 ``CompressionParameters.from_level()`` instead. |
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431 * The arguments to ``CompressionParameters.__init__()`` have changed. If you |
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432 were using positional arguments before, the positions now map to different |
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433 arguments. It is recommended to use keyword arguments to construct |
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434 ``CompressionParameters`` instances. |
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435 * ``TARGETLENGTH_MAX`` constant has been removed (it disappeared from zstandard |
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436 1.3.4). |
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|
437 * ``ZstdCompressor.write_to()`` and ``ZstdDecompressor.write_to()`` have been |
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|
438 renamed to ``ZstdCompressor.stream_writer()`` and |
b1fb341d8a61
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|
439 ``ZstdDecompressor.stream_writer()``, respectively. The old names are still |
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|
440 aliased, but will be removed in the next major release. |
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|
441 * Content sizes are written into frame headers by default |
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|
442 (``ZstdCompressor(write_content_size=True)`` is now the default). |
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|
443 * ``CompressionParameters`` has been renamed to ``ZstdCompressionParameters`` |
b1fb341d8a61
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parents:
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|
444 for consistency with other types. The old name is an alias and will be removed |
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|
445 in the next major release. |
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|
446 |
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|
447 Bug Fixes |
b1fb341d8a61
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|
448 --------- |
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|
449 |
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|
450 * Fixed memory leak in ``ZstdCompressor.copy_stream()`` (#40) (from 0.8.2). |
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|
451 * Fixed memory leak in ``ZstdDecompressor.copy_stream()`` (#35) (from 0.8.2). |
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|
452 * Fixed memory leak of ``ZSTD_DDict`` instances in CFFI's ``ZstdDecompressor``. |
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|
453 |
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|
454 New Features |
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|
455 ------------ |
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456 |
40121
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|
457 * Bundled zstandard library upgraded from 1.1.3 to 1.3.4. This delivers various |
37495
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458 bug fixes and performance improvements. It also gives us access to newer |
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459 features. |
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460 * Support for negative compression levels. |
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461 * Support for *long distance matching* (facilitates compression ratios that approach |
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|
462 LZMA). |
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463 * Supporting for reading empty zstandard frames (with an embedded content size |
b1fb341d8a61
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464 of 0). |
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|
465 * Support for writing and partial support for reading zstandard frames without a |
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466 magic header. |
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467 * New ``stream_reader()`` API that exposes the ``io.RawIOBase`` interface (allows |
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|
468 you to ``.read()`` from a file-like object). |
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|
469 * Several minor features, bug fixes, and performance enhancements. |
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470 * Wheels for Linux and macOS are now provided with releases. |
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|
471 |
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|
472 Changes |
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|
473 ------- |
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|
474 |
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475 * Functions accepting bytes data now use the buffer protocol and can accept |
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476 more types (like ``memoryview`` and ``bytearray``) (#26). |
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477 * Add #includes so compilation on OS X and BSDs works (#20). |
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478 * New ``ZstdDecompressor.stream_reader()`` API to obtain a read-only i/o stream |
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479 of decompressed data for a source. |
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|
480 * New ``ZstdCompressor.stream_reader()`` API to obtain a read-only i/o stream of |
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481 compressed data for a source. |
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482 * Renamed ``ZstdDecompressor.read_from()`` to ``ZstdDecompressor.read_to_iter()``. |
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483 The old name is still available. |
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484 * Renamed ``ZstdCompressor.read_from()`` to ``ZstdCompressor.read_to_iter()``. |
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485 ``read_from()`` is still available at its old location. |
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|
486 * Introduce the ``zstandard`` module to import and re-export the C or CFFI |
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487 *backend* as appropriate. Behavior can be controlled via the |
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|
488 ``PYTHON_ZSTANDARD_IMPORT_POLICY`` environment variable. See README for |
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489 usage info. |
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|
490 * Vendored version of zstd upgraded to 1.3.4. |
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|
491 * Added module constants ``CONTENTSIZE_UNKNOWN`` and ``CONTENTSIZE_ERROR``. |
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|
492 * Add ``STRATEGY_BTULTRA`` compression strategy constant. |
b1fb341d8a61
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parents:
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|
493 * Switch from deprecated ``ZSTD_getDecompressedSize()`` to |
b1fb341d8a61
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|
494 ``ZSTD_getFrameContentSize()`` replacement. |
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|
495 * ``ZstdCompressor.compress()`` can now compress empty inputs without requiring |
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|
496 special handling. |
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|
497 * ``ZstdCompressor`` and ``ZstdDecompressor`` now have a ``memory_size()`` |
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|
498 method for determining the current memory utilization of the underlying zstd |
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|
499 primitive. |
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|
500 * ``train_dictionary()`` has new arguments and functionality for trying multiple |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
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parents:
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|
501 variations of COVER parameters and selecting the best one. |
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parents:
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|
502 * Added module constants ``LDM_MINMATCH_MIN``, ``LDM_MINMATCH_MAX``, and |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
503 ``LDM_BUCKETSIZELOG_MAX``. |
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|
504 * Converted all consumers to the zstandard *new advanced API*, which uses |
b1fb341d8a61
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parents:
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|
505 ``ZSTD_compress_generic()`` |
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parents:
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|
506 * ``CompressionParameters.__init__`` now accepts several more arguments, |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
507 including support for *long distance matching*. |
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zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
508 * ``ZstdCompressionDict.__init__`` now accepts a ``dict_type`` argument that |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
509 controls how the dictionary should be interpreted. This can be used to |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
510 force the use of *content-only* dictionaries or to require the presence |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
511 of the dictionary magic header. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
31847
diff
changeset
|
512 * ``ZstdCompressionDict.precompute_compress()`` can be used to precompute the |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
513 compression dictionary so it can efficiently be used with multiple |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
514 ``ZstdCompressor`` instances. |
b1fb341d8a61
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
31847
diff
changeset
|
515 * Digested dictionaries are now stored in ``ZstdCompressionDict`` instances, |
b1fb341d8a61
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
516 created automatically on first use, and automatically reused by all |
b1fb341d8a61
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parents:
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changeset
|
517 ``ZstdDecompressor`` instances bound to that dictionary. |
b1fb341d8a61
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
518 * All meaningful functions now accept keyword arguments. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
31847
diff
changeset
|
519 * ``ZstdDecompressor.decompressobj()`` now accepts a ``write_size`` argument |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
520 to control how much work to perform on every decompressor invocation. |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
521 * ``ZstdCompressor.write_to()`` now exposes a ``tell()``, which exposes the |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
522 total number of bytes written so far. |
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zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
523 * ``ZstdDecompressor.stream_reader()`` now supports ``seek()`` when moving |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
524 forward in the stream. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
31847
diff
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|
525 * Removed ``TARGETLENGTH_MAX`` constant. |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
526 * Added ``frame_header_size(data)`` function. |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
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parents:
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|
527 * Added ``frame_content_size(data)`` function. |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
31847
diff
changeset
|
528 * Consumers of ``ZSTD_decompress*`` have been switched to the new *advanced |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
529 decompression* API. |
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zstandard: vendor python-zstandard 0.9.0
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parents:
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changeset
|
530 * ``ZstdCompressor`` and ``ZstdCompressionParams`` can now be constructed with |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
531 negative compression levels. |
b1fb341d8a61
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
31847
diff
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|
532 * ``ZstdDecompressor`` now accepts a ``max_window_size`` argument to limit the |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
533 amount of memory required for decompression operations. |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
534 * ``FORMAT_ZSTD1`` and ``FORMAT_ZSTD1_MAGICLESS`` constants to be used with |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
535 the ``format`` compression parameter to control whether the frame magic |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
536 header is written. |
b1fb341d8a61
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
31847
diff
changeset
|
537 * ``ZstdDecompressor`` now accepts a ``format`` argument to control the |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
31847
diff
changeset
|
538 expected frame format. |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
539 * ``ZstdCompressor`` now has a ``frame_progression()`` method to return |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
540 information about the current compression operation. |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
541 * Error messages in CFFI no longer have ``b''`` literals. |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
542 * Compiler warnings and underlying overflow issues on 32-bit platforms have been |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
543 fixed. |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
544 * Builds in CI now build with compiler warnings as errors. This should hopefully |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
545 fix new compiler warnings from being introduced. |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
31847
diff
changeset
|
546 * Make ``ZstdCompressor(write_content_size=True)`` and |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
547 ``CompressionParameters(write_content_size=True)`` the default. |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
548 * ``CompressionParameters`` has been renamed to ``ZstdCompressionParameters``. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
549 |
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zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
550 0.8.2 (released 2018-02-22) |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
551 --------------------------- |
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parents:
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diff
changeset
|
552 |
b1fb341d8a61
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
31847
diff
changeset
|
553 * Fixed memory leak in ``ZstdCompressor.copy_stream()`` (#40). |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
31847
diff
changeset
|
554 * Fixed memory leak in ``ZstdDecompressor.copy_stream()`` (#35). |
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
555 |
31847
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
556 0.8.1 (released 2017-04-08) |
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zstd: vendor python-zstandard 0.8.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
557 --------------------------- |
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zstd: vendor python-zstandard 0.8.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
558 |
39d36c2db68e
zstd: vendor python-zstandard 0.8.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
31796
diff
changeset
|
559 * Add #includes so compilation on OS X and BSDs works (#20). |
39d36c2db68e
zstd: vendor python-zstandard 0.8.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
31796
diff
changeset
|
560 |
31796
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zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
561 0.8.0 (released 2017-03-08) |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
562 =========================== |
31796
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zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
563 |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
564 * CompressionParameters now has a estimated_compression_context_size() method. |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
565 zstd.estimate_compression_context_size() is now deprecated and slated for |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
566 removal. |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
567 * Implemented a lot of fuzzing tests. |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
568 * CompressionParameters instances now perform extra validation by calling |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
569 ZSTD_checkCParams() at construction time. |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
570 * multi_compress_to_buffer() API for compressing multiple inputs as a |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
571 single operation, as efficiently as possible. |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
572 * ZSTD_CStream instances are now used across multiple operations on |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
573 ZstdCompressor instances, resulting in much better performance for |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
574 APIs that do streaming. |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
575 * ZSTD_DStream instances are now used across multiple operations on |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
576 ZstdDecompressor instances, resulting in much better performance for |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
577 APIs that do streaming. |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
578 * train_dictionary() now releases the GIL. |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
579 * Support for training dictionaries using the COVER algorithm. |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
580 * multi_decompress_to_buffer() API for decompressing multiple frames as a |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
581 single operation, as efficiently as possible. |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
582 * Support for multi-threaded compression. |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
583 * Disable deprecation warnings when compiling CFFI module. |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
584 * Fixed memory leak in train_dictionary(). |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
585 * Removed DictParameters type. |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
586 * train_dictionary() now accepts keyword arguments instead of a |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
587 DictParameters instance to control dictionary generation. |
e0dc40530c5a
zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30895
diff
changeset
|
588 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
589 0.7.0 (released 2017-02-07) |
37495
b1fb341d8a61
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
590 =========================== |
30895
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parents:
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|
591 |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
592 * Added zstd.get_frame_parameters() to obtain info about a zstd frame. |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
593 * Added ZstdDecompressor.decompress_content_dict_chain() for efficient |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
594 decompression of *content-only dictionary chains*. |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
595 * CFFI module fully implemented; all tests run against both C extension and |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
596 CFFI implementation. |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
597 * Vendored version of zstd updated to 1.1.3. |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
598 * Use ZstdDecompressor.decompress() now uses ZSTD_createDDict_byReference() |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
599 to avoid extra memory allocation of dict data. |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
600 * Add function names to error messages (by using ":name" in PyArg_Parse* |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
601 functions). |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
602 * Reuse decompression context across operations. Previously, we created a |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
603 new ZSTD_DCtx for each decompress(). This was measured to slow down |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
604 decompression by 40-200MB/s. The API guarantees say ZstdDecompressor |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
605 is not thread safe. So we reuse the ZSTD_DCtx across operations and make |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
606 things faster in the process. |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
607 * ZstdCompressor.write_to()'s compress() and flush() methods now return number |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
608 of bytes written. |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
609 * ZstdDecompressor.write_to()'s write() method now returns the number of bytes |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
610 written to the underlying output object. |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
611 * CompressionParameters instances now expose their values as attributes. |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
612 * CompressionParameters instances no longer are subscriptable nor behave |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
613 as tuples (backwards incompatible). Use attributes to obtain values. |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
614 * DictParameters instances now expose their values as attributes. |
c32454d69b85
zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30822
diff
changeset
|
615 |
30822
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
616 0.6.0 (released 2017-01-14) |
37495
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zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
31847
diff
changeset
|
617 =========================== |
30822
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
618 |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
619 * Support for legacy zstd protocols (build time opt in feature). |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
620 * Automation improvements to test against Python 3.6, latest versions |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
621 of Tox, more deterministic AppVeyor behavior. |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
622 * CFFI "parser" improved to use a compiler preprocessor instead of rewriting |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
623 source code manually. |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
624 * Vendored version of zstd updated to 1.1.2. |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
625 * Documentation improvements. |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
626 * Introduce a bench.py script for performing (crude) benchmarks. |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
627 * ZSTD_CCtx instances are now reused across multiple compress() operations. |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
628 * ZstdCompressor.write_to() now has a flush() method. |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
629 * ZstdCompressor.compressobj()'s flush() method now accepts an argument to |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
630 flush a block (as opposed to ending the stream). |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
631 * Disallow compress(b'') when writing content sizes by default (issue #11). |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
632 |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
633 0.5.2 (released 2016-11-12) |
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
634 =========================== |
30822
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parents:
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diff
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|
635 |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
636 * more packaging fixes for source distribution |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
637 |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
638 0.5.1 (released 2016-11-12) |
37495
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
31847
diff
changeset
|
639 =========================== |
30822
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
640 |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
641 * setup_zstd.py is included in the source distribution |
b54a2984cdd4
zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
30435
diff
changeset
|
642 |
30435
b86a448a2965
zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
643 0.5.0 (released 2016-11-10) |
37495
b1fb341d8a61
zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
31847
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changeset
|
644 =========================== |
30435
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
645 |
b86a448a2965
zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
646 * Vendored version of zstd updated to 1.1.1. |
b86a448a2965
zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
647 * Continuous integration for Python 3.6 and 3.7 |
b86a448a2965
zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
648 * Continuous integration for Conda |
b86a448a2965
zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
649 * Added compression and decompression APIs providing similar interfaces |
b86a448a2965
zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
650 to the standard library ``zlib`` and ``bz2`` modules. This allows |
b86a448a2965
zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
651 coding to a common interface. |
b86a448a2965
zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
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652 * ``zstd.__version__` is now defined. |
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653 * ``read_from()`` on various APIs now accepts objects implementing the buffer |
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654 protocol. |
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655 * ``read_from()`` has gained a ``skip_bytes`` argument. This allows callers |
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656 to pass in an existing buffer with a header without having to create a |
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657 slice or a new object. |
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658 * Implemented ``ZstdCompressionDict.as_bytes()``. |
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659 * Python's memory allocator is now used instead of ``malloc()``. |
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660 * Low-level zstd data structures are reused in more instances, cutting down |
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661 on overhead for certain operations. |
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662 * ``distutils`` boilerplate for obtaining an ``Extension`` instance |
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663 has now been refactored into a standalone ``setup_zstd.py`` file. This |
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zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
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664 allows other projects with ``setup.py`` files to reuse the |
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665 ``distutils`` code for this project without copying code. |
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666 * The monolithic ``zstd.c`` file has been split into a header file defining |
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667 types and separate ``.c`` source files for the implementation. |
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668 |
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669 Older History |
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670 ============= |
30435
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671 |
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672 2016-08-31 - Zstandard 1.0.0 is released and Gregory starts hacking on a |
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673 Python extension for use by the Mercurial project. A very hacky prototype |
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674 is sent to the mercurial-devel list for RFC. |
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675 |
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676 2016-09-03 - Most functionality from Zstandard C API implemented. Source |
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677 code published on https://github.com/indygreg/python-zstandard. Travis-CI |
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678 automation configured. 0.0.1 release on PyPI. |
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679 |
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680 2016-09-05 - After the API was rounded out a bit and support for Python |
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681 2.6 and 2.7 was added, version 0.1 was released to PyPI. |
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682 |
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683 2016-09-05 - After the compressor and decompressor APIs were changed, 0.2 |
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684 was released to PyPI. |
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685 |
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686 2016-09-10 - 0.3 is released with a bunch of new features. ZstdCompressor |
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687 now accepts arguments controlling frame parameters. The source size can now |
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688 be declared when performing streaming compression. ZstdDecompressor.decompress() |
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689 is implemented. Compression dictionaries are now cached when using the simple |
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690 compression and decompression APIs. Memory size APIs added. |
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691 ZstdCompressor.read_from() and ZstdDecompressor.read_from() have been |
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692 implemented. This rounds out the major compression/decompression APIs planned |
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693 by the author. |
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694 |
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695 2016-10-02 - 0.3.3 is released with a bug fix for read_from not fully |
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696 decoding a zstd frame (issue #2). |
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697 |
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698 2016-10-02 - 0.4.0 is released with zstd 1.1.0, support for custom read and |
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699 write buffer sizes, and a few bug fixes involving failure to read/write |
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700 all data when buffer sizes were too small to hold remaining data. |
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701 |
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702 2016-11-10 - 0.5.0 is released with zstd 1.1.1 and other enhancements. |