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

[ CVSweb ] [ Homepage ] [ RSS ] [ Required by ] [ Add to tracker ]

Branch: CURRENT, Version: 0.10.2, Package name: py27-zstandard-0.10.2, Maintainer: pkgsrc-users

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

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

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

Required to build:

Master sites:

SHA1: 34927eb1c094a98ffcdbd7af995e4d7695d1a878
RMD160: c8f080cde62a0cb8c95d806a88868f9e535c9e8b
Filesize: 597.309 KB

Version history: (Expand)

CVS history: (Expand)

   2018-11-04 23:12:03 by Adam Ciarcinski | Files touched by this commit (3) | Package updated
Log message:
py-zstandard: updated to 0.10.2


Bug Fixes
* zstd_cffi.py added to setup.py

* Change some integer casts to avoid ssize_t
   2018-10-22 17:32:01 by Adam Ciarcinski | Files touched by this commit (1)
Log message:
py-zstandard: add missing patch
   2018-10-22 17:31:00 by Adam Ciarcinski | Files touched by this commit (2) | Package updated
Log message:
py-zstandard: updated to 0.10.1


Backwards Compatibility Notes
* ZstdCompressor.stream_reader().closed is now a property instead of a
* ZstdDecompressor.stream_reader().closed is now a property instead of a

* Stop attempting to package Python 3.6 for Miniconda. The latest version of
  Miniconda is using Python 3.7. The Python 3.6 Miniconda packages were a lie
  since this were built against Python 3.7.
* ZstdCompressor.stream_reader()'s and ZstdDecompressor.stream_reader()'s
  closed attribute is now a read-only property instead of a method. This now
  properly matches the IOBase API and allows instances to be used in more
  places that accept IOBase instances.


Backwards Compatibility Notes
* ZstdDecompressor.stream_reader().read() now consistently requires an
  argument in both the C and CFFI backends. Before, the CFFI implementation
  would assume a default value of -1, which was later rejected.
* The compress_literals argument and attribute has been removed from
  zstd.ZstdCompressionParameters because it was removed by the zstd 1.3.5
* ZSTD_CCtx_setParametersUsingCCtxParams() is no longer called on every
  operation performed against ZstdCompressor instances. The reason for this
  change is that the zstd 1.3.5 API no longer allows this without calling
  ZSTD_CCtx_resetParameters() first. But if we called
  ZSTD_CCtx_resetParameters() on every operation, we'd have to redo
  potentially expensive setup when using dictionaries. We now call
  ZSTD_CCtx_reset() on every operation and don't attempt to change
  compression parameters.
* Objects returned by ZstdCompressor.stream_reader() no longer need to be
  used as a context manager. The context manager interface still exists and its
  behavior is unchanged.
* Objects returned by ZstdDecompressor.stream_reader() no longer need to be
  used as a context manager. The context manager interface still exists and its
  behavior is unchanged.

Bug Fixes
* ZstdDecompressor.decompressobj().decompress() should now return all data
  from internal buffers in more scenarios. Before, it was possible for data to
  remain in internal buffers. This data would be emitted on a subsequent call
  to decompress(). The overall output stream would still be valid. But if
  callers were expecting input data to exactly map to output data (say the
  producer had used flush(COMPRESSOBJ_FLUSH_BLOCK) and was attempting to
  map input chunks to output chunks), then the previous behavior would be
  wrong. The new behavior is such that output from
  flush(COMPRESSOBJ_FLUSH_BLOCK) fed into decompressobj().decompress()
  should produce all available compressed input.
* ZstdDecompressor.stream_reader().read() should no longer segfault after
  a previous context manager resulted in error.
* ZstdCompressor.compressobj().flush(COMPRESSOBJ_FLUSH_BLOCK) now returns
  all data necessary to flush a block. Before, it was possible for the
  flush() to not emit all data necessary to fully represent a block. This
  would mean decompressors wouldn't be able to decompress all data that had been
  fed into the compressor and flush()ed.

New Features
  TARGETLENGTH_MAX that expose constants from libzstd.
* New ZstdCompressor.chunker() API for manually feeding data into a
  compressor and emitting chunks of a fixed size. Like compressobj(), the
  API doesn't impose restrictions on the input or output types for the
  data streams. Unlike compressobj(), it ensures output chunks are of a
  fixed size. This makes this API useful when the compressed output is being
  fed into an I/O layer, where uniform write sizes are useful.
* ZstdCompressor.stream_reader() no longer needs to be used as a context
* ZstdDecompressor.stream_reader() no longer needs to be used as a context
* Bundled zstandard library upgraded from 1.3.4 to 1.3.6.

* Added zstd_cffi.py and NEWS.rst to MANIFEST.in.
* zstandard.__version__ is now defined.
* Upgrade pip, setuptools, wheel, and cibuildwheel packages to latest versions.
* Upgrade various packages used in CI to latest versions. Notably tox (in
  order to support Python 3.7).
* Use relative paths in setup.py to appease Python 3.7.
* Added CI for Python 3.7.
   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

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


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 \ 
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 \ 
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 \ 
Support for negative compression levels.
Support for long distance matching (facilitates compression ratios that approach \ 
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.


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.
Add STRATEGY_BTULTRA compression strategy constant.
Switch from deprecated ZSTD_getDecompressedSize() to ZSTD_getFrameContentSize() \ 
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.
Converted all consumers to the zstandard new advanced API, which uses \ 
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 \ 
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 \ 
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

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

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

CompressionParameters now has a estimated_compression_context_size() method. \ 
zstd.estimate_compression_context_size() is now deprecated and slated for \ 
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.