NEWS.rst
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r30435 | Version History | ||
=============== | ||||
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r31847 | 0.8.1 (released 2017-04-08) | ||
--------------------------- | ||||
* Add #includes so compilation on OS X and BSDs works (#20). | ||||
|
r31796 | 0.8.0 (released 2017-03-08) | ||
--------------------------- | ||||
* CompressionParameters now has a estimated_compression_context_size() method. | ||||
zstd.estimate_compression_context_size() is now deprecated and slated for | ||||
removal. | ||||
* Implemented a lot of fuzzing tests. | ||||
* CompressionParameters instances now perform extra validation by calling | ||||
ZSTD_checkCParams() at construction time. | ||||
* multi_compress_to_buffer() API for compressing multiple inputs as a | ||||
single operation, as efficiently as possible. | ||||
* ZSTD_CStream instances are now used across multiple operations on | ||||
ZstdCompressor instances, resulting in much better performance for | ||||
APIs that do streaming. | ||||
* ZSTD_DStream instances are now used across multiple operations on | ||||
ZstdDecompressor instances, resulting in much better performance for | ||||
APIs that do streaming. | ||||
* train_dictionary() now releases the GIL. | ||||
* Support for training dictionaries using the COVER algorithm. | ||||
* multi_decompress_to_buffer() API for decompressing multiple frames as a | ||||
single operation, as efficiently as possible. | ||||
* Support for multi-threaded compression. | ||||
* Disable deprecation warnings when compiling CFFI module. | ||||
* Fixed memory leak in train_dictionary(). | ||||
* Removed DictParameters type. | ||||
* train_dictionary() now accepts keyword arguments instead of a | ||||
DictParameters instance to control dictionary generation. | ||||
|
r30895 | 0.7.0 (released 2017-02-07) | ||
--------------------------- | ||||
* Added zstd.get_frame_parameters() to obtain info about a zstd frame. | ||||
* Added ZstdDecompressor.decompress_content_dict_chain() for efficient | ||||
decompression of *content-only dictionary chains*. | ||||
* CFFI module fully implemented; all tests run against both C extension and | ||||
CFFI implementation. | ||||
* Vendored version of zstd updated to 1.1.3. | ||||
* Use ZstdDecompressor.decompress() now uses ZSTD_createDDict_byReference() | ||||
to avoid extra memory allocation of dict data. | ||||
* Add function names to error messages (by using ":name" in PyArg_Parse* | ||||
functions). | ||||
* Reuse decompression context across operations. Previously, we created a | ||||
new ZSTD_DCtx for each decompress(). This was measured to slow down | ||||
decompression by 40-200MB/s. The API guarantees say ZstdDecompressor | ||||
is not thread safe. So we reuse the ZSTD_DCtx across operations and make | ||||
things faster in the process. | ||||
* ZstdCompressor.write_to()'s compress() and flush() methods now return number | ||||
of bytes written. | ||||
* ZstdDecompressor.write_to()'s write() method now returns the number of bytes | ||||
written to the underlying output object. | ||||
* CompressionParameters instances now expose their values as attributes. | ||||
* CompressionParameters instances no longer are subscriptable nor behave | ||||
as tuples (backwards incompatible). Use attributes to obtain values. | ||||
* DictParameters instances now expose their values as attributes. | ||||
|
r30822 | 0.6.0 (released 2017-01-14) | ||
--------------------------- | ||||
* Support for legacy zstd protocols (build time opt in feature). | ||||
* Automation improvements to test against Python 3.6, latest versions | ||||
of Tox, more deterministic AppVeyor behavior. | ||||
* CFFI "parser" improved to use a compiler preprocessor instead of rewriting | ||||
source code manually. | ||||
* Vendored version of zstd updated to 1.1.2. | ||||
* Documentation improvements. | ||||
* Introduce a bench.py script for performing (crude) benchmarks. | ||||
* ZSTD_CCtx instances are now reused across multiple compress() operations. | ||||
* ZstdCompressor.write_to() now has a flush() method. | ||||
* ZstdCompressor.compressobj()'s flush() method now accepts an argument to | ||||
flush a block (as opposed to ending the stream). | ||||
* Disallow compress(b'') when writing content sizes by default (issue #11). | ||||
0.5.2 (released 2016-11-12) | ||||
--------------------------- | ||||
* more packaging fixes for source distribution | ||||
0.5.1 (released 2016-11-12) | ||||
--------------------------- | ||||
* setup_zstd.py is included in the source distribution | ||||
|
r30435 | 0.5.0 (released 2016-11-10) | ||
--------------------------- | ||||
* Vendored version of zstd updated to 1.1.1. | ||||
* Continuous integration for Python 3.6 and 3.7 | ||||
* Continuous integration for Conda | ||||
* Added compression and decompression APIs providing similar interfaces | ||||
to the standard library ``zlib`` and ``bz2`` modules. This allows | ||||
coding to a common interface. | ||||
* ``zstd.__version__` is now defined. | ||||
* ``read_from()`` on various APIs now accepts objects implementing the buffer | ||||
protocol. | ||||
* ``read_from()`` has gained a ``skip_bytes`` argument. This allows callers | ||||
to pass in an existing buffer with a header without having to create a | ||||
slice or a new object. | ||||
* Implemented ``ZstdCompressionDict.as_bytes()``. | ||||
* Python's memory allocator is now used instead of ``malloc()``. | ||||
* Low-level zstd data structures are reused in more instances, cutting down | ||||
on overhead for certain operations. | ||||
* ``distutils`` boilerplate for obtaining an ``Extension`` instance | ||||
has now been refactored into a standalone ``setup_zstd.py`` file. This | ||||
allows other projects with ``setup.py`` files to reuse the | ||||
``distutils`` code for this project without copying code. | ||||
* The monolithic ``zstd.c`` file has been split into a header file defining | ||||
types and separate ``.c`` source files for the implementation. | ||||
History of the Project | ||||
====================== | ||||
2016-08-31 - Zstandard 1.0.0 is released and Gregory starts hacking on a | ||||
Python extension for use by the Mercurial project. A very hacky prototype | ||||
is sent to the mercurial-devel list for RFC. | ||||
2016-09-03 - Most functionality from Zstandard C API implemented. Source | ||||
code published on https://github.com/indygreg/python-zstandard. Travis-CI | ||||
automation configured. 0.0.1 release on PyPI. | ||||
2016-09-05 - After the API was rounded out a bit and support for Python | ||||
2.6 and 2.7 was added, version 0.1 was released to PyPI. | ||||
2016-09-05 - After the compressor and decompressor APIs were changed, 0.2 | ||||
was released to PyPI. | ||||
2016-09-10 - 0.3 is released with a bunch of new features. ZstdCompressor | ||||
now accepts arguments controlling frame parameters. The source size can now | ||||
be declared when performing streaming compression. ZstdDecompressor.decompress() | ||||
is implemented. Compression dictionaries are now cached when using the simple | ||||
compression and decompression APIs. Memory size APIs added. | ||||
ZstdCompressor.read_from() and ZstdDecompressor.read_from() have been | ||||
implemented. This rounds out the major compression/decompression APIs planned | ||||
by the author. | ||||
2016-10-02 - 0.3.3 is released with a bug fix for read_from not fully | ||||
decoding a zstd frame (issue #2). | ||||
2016-10-02 - 0.4.0 is released with zstd 1.1.0, support for custom read and | ||||
write buffer sizes, and a few bug fixes involving failure to read/write | ||||
all data when buffer sizes were too small to hold remaining data. | ||||
2016-11-10 - 0.5.0 is released with zstd 1.1.1 and other enhancements. | ||||