./archivers/py-zstandard, Zstandard bindings for Python

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Branch: CURRENT, Version: 0.9.1, Package name: py27-zstandard-0.9.1, Maintainer: pkgsrc-users

This project provides Python bindings for interfacing with the
Zstandard compression library. A C extension and CFFI interface are
provided.

The primary goal of the project is to provide a rich interface to
the underlying C API through a Pythonic interface while not sacrificing
performance. This means exposing most of the features and flexibility
of the C API while not sacrificing usability or safety that Python
provides.


Required to run:
[devel/py-setuptools] [lang/python27] [devel/py-cffi]

Required to build:
[pkgtools/cwrappers]

Master sites:

SHA1: 2f17c5c19d12df84f57c5293955f695f6e482010
RMD160: 97dd22b38c1f6ae184d67189564249bbea8d842a
Filesize: 545.883 KB

Version history: (Expand)


CVS history: (Expand)


   2018-06-18 12:45:32 by Adam Ciarcinski | Files touched by this commit (2) | Package updated
Log message:
py-zstandard: updated to 0.9.1

0.9.1:
This release contains packaging improvements. No changes to the Python library \ 
code were made in this release.
   2018-04-09 09:37:33 by Adam Ciarcinski | Files touched by this commit (3) | Package updated
Log message:
py-zstandard: updated to 0.9.0

0.9.0:

Backwards Compatibility Notes

CFFI 1.11 or newer is now required (previous requirement was 1.8).
The primary module is now zstandard. Please change imports of zstd and zstd_cffi \ 
to import zstandard. See the README for more. Support for importing the old \ 
names will be dropped in the next release.
ZstdCompressor.read_from() and ZstdDecompressor.read_from() have been renamed to \ 
read_to_iter(). read_from() is aliased to the new name and will be deleted in a \ 
future release.
Support for Python 2.6 has been removed.
Support for Python 3.3 has been removed.
The selectivity argument to train_dictionary() has been removed, as the feature \ 
disappeared from zstd 1.3.
Support for legacy dictionaries has been removed. Cover dictionaries are now the \ 
default. train_cover_dictionary() has effectively been renamed to \ 
train_dictionary().
The allow_empty argument from ZstdCompressor.compress() has been deleted and the \ 
method now allows empty inputs to be compressed by default.
estimate_compression_context_size() has been removed. Use \ 
CompressionParameters.estimated_compression_context_size() instead.
get_compression_parameters() has been removed. Use \ 
CompressionParameters.from_level() instead.
The arguments to CompressionParameters.__init__() have changed. If you were \ 
using positional arguments before, the positions now map to different arguments. \ 
It is recommended to use keyword arguments to construct CompressionParameters \ 
instances.
TARGETLENGTH_MAX constant has been removed (it disappeared from zstandard 1.3.4).
ZstdCompressor.write_to() and ZstdDecompressor.write_to() have been renamed to \ 
ZstdCompressor.stream_writer() and ZstdDecompressor.stream_writer(), \ 
respectively. The old names are still aliased, but will be removed in the next \ 
major release.
Content sizes are written into frame headers by default \ 
(ZstdCompressor(write_content_size=True) is now the default).
CompressionParameters has been renamed to ZstdCompressionParameters for \ 
consistency with other types. The old name is an alias and will be removed in \ 
the next major release.

Bug Fixes

Fixed memory leak in ZstdCompressor.copy_stream().
Fixed memory leak in ZstdDecompressor.copy_stream().
Fixed memory leak of ZSTD_DDict instances in CFFI's ZstdDecompressor.

New Features

Bundlded zstandard library upgraded from 1.1.3 to 1.3.4. This delivers various \ 
bug fixes and performance improvements. It also gives us access to newer \ 
features.
Support for negative compression levels.
Support for long distance matching (facilitates compression ratios that approach \ 
LZMA).
Supporting for reading empty zstandard frames (with an embedded content size of 0).
Support for writing and partial support for reading zstandard frames without a \ 
magic header.
New stream_reader() API that exposes the io.RawIOBase interface (allows you to \ 
.read() from a file-like object).
Several minor features, bug fixes, and performance enhancements.
Wheels for Linux and macOS are now provided with releases.

Changes

Functions accepting bytes data now use the buffer protocol and can accept more \ 
types (like memoryview and bytearray).
Add #includes so compilation on OS X and BSDs works.
New ZstdDecompressor.stream_reader() API to obtain a read-only i/o stream of \ 
decompressed data for a source.
New ZstdCompressor.stream_reader() API to obtain a read-only i/o stream of \ 
compressed data for a source.
Renamed ZstdDecompressor.read_from() to ZstdDecompressor.read_to_iter(). The old \ 
name is still available.
Renamed ZstdCompressor.read_from() to ZstdCompressor.read_to_iter(). read_from() \ 
is still available at its old location.
Introduce the zstandard module to import and re-export the C or CFFI backend as \ 
appropriate. Behavior can be controlled via the PYTHON_ZSTANDARD_IMPORT_POLICY \ 
environment variable. See README for usage info.
Vendored version of zstd upgraded to 1.3.4.
Added module constants CONTENTSIZE_UNKNOWN and CONTENTSIZE_ERROR.
Add STRATEGY_BTULTRA compression strategy constant.
Switch from deprecated ZSTD_getDecompressedSize() to ZSTD_getFrameContentSize() \ 
replacement.
ZstdCompressor.compress() can now compress empty inputs without requiring \ 
special handling.
ZstdCompressor and ZstdDecompressor now have a memory_size() method for \ 
determining the current memory utilization of the underlying zstd primitive.
train_dictionary() has new arguments and functionality for trying multiple \ 
variations of COVER parameters and selecting the best one.
Added module constants LDM_MINMATCH_MIN, LDM_MINMATCH_MAX, and LDM_BUCKETSIZELOG_MAX.
Converted all consumers to the zstandard new advanced API, which uses \ 
ZSTD_compress_generic()
CompressionParameters.__init__ now accepts several more arguments, including \ 
support for long distance matching.
ZstdCompressionDict.__init__ now accepts a dict_type argument that controls how \ 
the dictionary should be interpreted. This can be used to force the use of \ 
content-only dictionaries or to require the presence of the dictionary magic \ 
header.
ZstdCompressionDict.precompute_compress() can be used to precompute the \ 
compression dictionary so it can efficiently be used with multiple \ 
ZstdCompressor instances.
Digested dictionaries are now stored in ZstdCompressionDict instances, created \ 
automatically on first use, and automatically reused by all ZstdDecompressor \ 
instances bound to that dictionary.
All meaningful functions now accept keyword arguments.
ZstdDecompressor.decompressobj() now accepts a write_size argument to control \ 
how much work to perform on every decompressor invocation.
ZstdCompressor.write_to() now exposes a tell(), which exposes the total number \ 
of bytes written so far.
ZstdDecompressor.stream_reader() now supports seek() when moving forward in the \ 
stream.
Removed TARGETLENGTH_MAX constant.
Added frame_header_size(data) function.
Added frame_content_size(data) function.
Consumers of ZSTD_decompress* have been switched to the new advanced \ 
decompression API.
ZstdCompressor and ZstdCompressionParams can now be constructed with negative \ 
compression levels.
ZstdDecompressor now accepts a max_window_size argument to limit the amount of \ 
memory required for decompression operations.
FORMAT_ZSTD1 and FORMAT_ZSTD1_MAGICLESS constants to be used with the format \ 
compression parameter to control whether the frame magic header is written.
ZstdDecompressor now accepts a format argument to control the expected frame format.
ZstdCompressor now has a frame_progression() method to return information about \ 
the current compression operation.
Error messages in CFFI no longer have b'' literals.
Compiler warnings and underlying overflow issues on 32-bit platforms have been fixed.
Builds in CI now build with compiler warnings as errors. This should hopefully \ 
fix new compiler warnings from being introduced.
Make ZstdCompressor(write_content_size=True) and \ 
CompressionParameters(write_content_size=True) the default.
CompressionParameters has been renamed to ZstdCompressionParameters.
   2018-03-23 14:42:59 by Adam Ciarcinski | Files touched by this commit (2) | Package updated
Log message:
py-zstandard: updated to 0.8.2

0.8.2:
Fixed memory leak in ZstdCompressor.copy_stream()
Fixed memory leak in ZstdDecompressor.copy_stream()
   2017-10-23 12:24:18 by Adam Ciarcinski | Files touched by this commit (4) | Package updated
Log message:
py-zstandard: update to 0.8.1

0.8.1:
Add #includes so compilation on OS X and BSDs works.

0.8.0:
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.
   2017-09-23 20:25:51 by Sebastian Wiedenroth | Files touched by this commit (3)
Log message:
py-zstandard: fix build

Temporarily remove the zstd buildlink as py-zstandard includes
its own version that it wants to use. Future versions will
support using a system supplied zstd but this one doesn't yet.

Also prevent setup.py from picking up cffi by accident so the
PLIST is stable.
   2017-03-08 15:54:26 by Thomas Klausner | Files touched by this commit (4)
Log message:
Import py-zstandard-0.7.0 as archivers/py-zstandard.

This project provides Python bindings for interfacing with the
Zstandard compression library. A C extension and CFFI interface are
provided.

The primary goal of the project is to provide a rich interface to
the underlying C API through a Pythonic interface while not sacrificing
performance. This means exposing most of the features and flexibility
of the C API while not sacrificing usability or safety that Python
provides.