Release notes
=============

..
    # Unindent the section between releases in order
    # to document your changes. On releases it will be
    # re-indented so that it does not show up in the notes.

    .. _unreleased:

    Unreleased
    ----------


.. _unreleased:

0.16.0
------

Enhancements
~~~~~~~~~~~~

* Add ``typesize`` argument to ``Blosc`` to allow for buffers that are passed to ``encode``
  use that information.  zarr v3 currently has its Blosc codec as bytes-to-bytes but does retain
  the size information so using it here allows for massive compression ratio gains.
  By :user:`Ilan Gold <ilan-gold>`
* Add support for the Linux aarch64 architecture,
  By :user:`Agriya Khetarpal <agriyakhetarpal>`, :issue:`288`.
* Preallocate output buffers and resize directly as needed.
  By :user:`John Kirkham <jakirkham>`, :issue:`656`
* ``Checksum32`` is now an abstract base clase, with ``checksum()`` as an abstract method.
  This helps ensure that any subclasses implement the ``checksum()`` method.
  :issue:`711`

Removals
~~~~~~~~

The following ``blosc`` funcitons are removed, with no replacement.
This is because they were not intended to be public API.

- ``numcodecs.blosc.init``
- ``numcodecs.blosc.destroy``
- ``numcodecs.blosc.compname_to_compcode``
- ``numcodecs.blosc.cbuffer_sizes``
- ``numcodecs.blosc.cbuffer_metainfo``

In addition, ``numcodecs.blosc.decompress_partial`` is removed as
has always been experimental and there is no equivalent in the official
blsoc Python package.
By :user:`David Stansby <dstansby>`, :issue:`712`

Maintenance
~~~~~~~~~~~
* Replace internal ``Buffer`` usage with ``memoryview``\ s.
  By :user:`John Kirkham <jakirkham>`, :issue:`656`
* Bump the minimum macOS deployment target for x86_64 to 10.13.
  By :user:`Agriya Khetarpal <agriyakhetarpal>`, :issue:`288`.


0.15.1
------

Improvements
~~~~~~~~~~~~
* Raise a custom `UnknownCodecError` when trying to retrieve an unavailable codec.
  By :user:`Cas Wognum <cwognum>`.

Fixes
~~~~~
* Remove redundant ``id`` from codec metadata serialization in Zarr3 codecs.
  By :user:`Norman Rzepka <normanrz>`, :issue:`685`

.. _release_0.15.0:

0.15.0
------

Breaking changes
~~~~~~~~~~~~~~~~
* All arguments to the ``PCodec`` constructor except for ``level``
  are now keyword only, to support the updated API.
  By :user:`Sam Levang <slevang>`, :issue:`623`

Deprecations
~~~~~~~~~~~~
The following ``blosc`` functions are deprecated, with no replacement.
This is because they are not intended to be public API.

- ``numcodecs.blosc.init``
- ``numcodecs.blosc.destroy``
- ``numcodecs.blosc.compname_to_compcode``
- ``numcodecs.blosc.cbuffer_sizes``
- ``numcodecs.blosc.cbuffer_metainfo``

In addition, ``numcodecs.blosc.decompress_partial`` is deprecated as
has always been experimental and there is no equivalent in the official
blsoc Python package.
By :user:`David Stansby <dstansby>`, :issue:`619`

Fixes
~~~~~
* Fixes issue with ``Delta`` Zarr 3 codec not working with ``astype``.
  By :user:`Norman Rzepka <normanrz>`, :issue:`664`
* Cleanup ``PCodec`` soft dependency.
  Previously importing ``numcodecs.pcodec`` would work if ``pcodec`` is not installed,
  but now it will fail to import. This mirrors the behaviour of other optional dependencies.
  By :user:`John Kirkham <jakirkham>`, :issue:`647`
* Fixes issues with the upcoming ``zarr`` 3.0.0 release.
  By :user:`Norman Rzepka <normanrz>`, :issue:`675`

* Removed Version Check: The previous code included a check for the `NumPy` version
  and a warning if the version was incompatible with `zfpy`.
  This check has been removed because `zfpy` now supports the newer versions of `NumPy`.
  By :user:`Meher Gajula <me-her>`, :issue:`672`

Improvements
~~~~~~~~~~~~
* Add support for ``pcodec`` 0.3. This exposes the new ``delta_spec``
  and ``paging_spec`` arguments, but maintains full backwards
  compatibility for data written with older package versions.
  By :user:`Sam Levang <slevang>`, :issue:`623`
* If an import error is raised when trying to define a codec that is *not*
  an optional dependency, it is no longer silently caught. Instead it will
  be propagated to the user, as this indicates an issue with the installed
  package.

  Import errors caused by optional dependencies (ZFPY, MsgPack, CRC32C, and PCodec)
  are still silently caught.
  By :user:`David Stansby <dstansby>`, :issue:`550`.

.. _release_0.14.1:

0.14.1
------

Fixes
~~~~~
* Cleanups to the ``crc32c`` soft dependency.
  Whereas in ``numcodecs`` 0.14.0 a runtime error was raised if
  the ``CRC32C`` codec used without the ``crc32c`` installed,
  the ``CRC32C`` codec is no longer defined at import time if
  ``crc32c`` is not installed. This has been changed to match
  the behaviour of other optional dependencies/codecs.
  By :user:`John Kirkham <jakirkham>`, :issue:`637`

Improvements
~~~~~~~~~~~~
* Add `noexcept` to `_utils` C-equiv functions
  By :user:`John Kirkham <jakirkham>`, :issue:`641`.

.. _release_0.14.0:

0.14.0
------

Enhancements
~~~~~~~~~~~~
* Add Crc32c checksum codec.
  By :user:`Norman Rzepka <normanrz>`, :issue:`613`.
* Add codec wrappers for Zarr 3.
  By :user:`Norman Rzepka <normanrz>`, :issue:`524`
* Added mypy type checking to continuous integration.
  By :user:`David Stansby <dstansby>`, :issue:`460`.

Fixes
~~~~~
* Fix in-place mutation of input array in `BitRound`.
  By :user:`Sam Levang <slevang>`, :issue:`608`
* Fix an issue where importing numcodecs would lock the state of `multiprocessing`
  and prevent user code to call `multiprocessing.set_start_method("spawn")`
  subsequently.
  By :user:`Clément Robert <neutrinoceros>` :issue:`522`

Maintenance
~~~~~~~~~~~
* The minimum supported Python version is now Python 3.11.
  By :user:`David Stansby <dstansby>`, :issue:`622`
* The minimum supported numpy version is now 1.24.
  By :user:`David Stansby <dstansby>`, :issue:`622`

.. _release_0.13.1:

0.13.1
------

Breaking changes
~~~~~~~~~~~~~~~~
* `Zstd.default_level`, `Zstd.min_level`, and `Zstd.max_level` are now class methods
  instead of properties. This means they must now be called like ``Zstd.default_level()``
  instead of ``Zstd.default_level``. This breaking change has been made because Python 3.13
  removes support for class properties.
  By :user:`David Stansby <dstansby>`, :issue:`576`.

Enhancements
~~~~~~~~~~~~

* Update bundled c-blosc to v1.26.1. This updates Zlib to v1.3.1
  and Zstd to v1.5.6.
  By :user:`David Stansby <dstansby>`, :issue:`560`.
* Added support for Python 3.13 :user:`David Stansby <dstansby>`, :issue:`576`.
* Cleaned up the table of contents in the documentation to list codecs by category
  :user:`David Stansby <dstansby>`, :issue:`458`.

Maintenance
~~~~~~~~~~~
* Change format() and old string formatting to f-strings.
  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>`, :issue:`439`.
* Remove pin on Sphinx
  By :user:`Elliott Sales de Andrade <QuLogic>`, :issue:`552`.


.. _release_0.13.0:

0.13.0
------

Enhancements
~~~~~~~~~~~~
* Add checksum flag to zstd and sets the default level to 0.
  By :user:`Norman Rzepka <normanrz>`, :issue:`519`.
* Add PCodec
  By :user:`Ryan Abernathey <rabernat>`, :issue:`501`.
* Use PyData theme for docs
  By :user:`John Kirkham <jakirkham>`, :issue:`485`.
* Improve the structure of docs
  By :user:`David Stansby <dstansby>`, :issue:`458`.

Fix
~~~
* Fix VLenUTF8 encoding for read-only buffers.
  By :user:`Isaac Virshup <ivirshup>`, :issue:`514`.
* Fix skip of entry points backport tests
  By :user:`Elliott Sales de Andrade <QuLogic>`, :issue:`487`.
* Fix Upgrade to Zstd 1.5.5 due to potential corruption.
  By :user:`Mark Kittisopikul <mkitti>`, :issue:`429`
* Add version constraint(<2.0) for numpy in zfpy.
  By :user:`Tom Liang <px39n>`, :issue:`540`.

Maintenance
~~~~~~~~~~~
* The minimum supported Python version is now Python 3.10.
  By :user:`David Stansby <dstansby>`, :issue:`531`
* Add numpy 2 compatibility.
  By :user:`David Stansby <dstansby>`, :issue:`535`
* Update c-blosc to 1.21.0 to 1.21.5, zstd from 1.4.8 to 1.5.5,
  lz4 from 1.9.3 to 1.9.4, and zlib from 1.2.8 to to 1.2.13
  By :user:`Mark Kittisopikul <mkitti>`, :issue:`500`


.. _release_0.12.1:

0.12.1
------

Fix
~~~

* ``Codec`` is now derived from ``abc.ABC``
  By :user:`Mads R. B. Kristensen <madsbk>`, :issue:`472`.
* Fix handling of entry points on older Python versions where ``importlib_metadata`` compatibility is concerned
  By :user:`Vyas Ramasubramani <vyasr>`, :issue:`478`.
* Make shuffle pyx functions ``noexcept``
  By :user:`Martin Durant <martindurant>`, :issue:`477`.

.. _release_0.12.0:

0.12.0
------

Enhancements
~~~~~~~~~~~~

* Add ``fletcher32`` checksum codec
  By :user:`Martin Durant <martindurant>`, :issue:`410`.
* Add ``jenkins_lookup3`` checksum codec
  By :user:`Mark Kittisopkul <mkitti>`, :issue:`445`.
* Support Python 3.12.
  By :user:`John Kirkham <jakirkham>`, :issue:`471`.

Fix
~~~

* Fixed docs/Makefile error message when sphinx is not present
  By :user:`Mark Kittisopikul <mkitti>`, :issue:`451`.
* Add missing RTD requirements
  By :user:`John Kirkham <jakirkham>`, :issue:`455`.

Maintenance
~~~~~~~~~~~

* Cleanup ``import``\ s in ``adhoc/blosc_memleak_check.py``
  By :user:`John Kirkham <jakirkham>`, :issue:`408`.

.. _release_0.11.0:

0.11.0
------

Fix
~~~

* Speed up isinstance checks of :class:`numcodecs.ndarray_like.NDArrayLike`,
  :class:`numcodecs.ndarray_like.DType` and :class:`numcodecs.ndarray_like.FlagsObj`.
  By :user:`Andreas Poehlmann <ap-->`, :issue:`379`.

Maintenance
~~~~~~~~~~~

* Remove unnecessary None argument to .get(), it is the default value.
  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>`, :issue:`395`.

* Apply refurb suggestions.
  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>`, :issue:`372`.

* Migrate codespell configuration to pyproject.toml and get rid of setup.cfg.
  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>` :issue:`374`.

* Unvendor cpuinfo.
  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>` :issue:`373`.

* Drop headers.
  By :user:`John Kirkham <jakirkham>`, :issue:`375`.

* Remove Python 2 code.
  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>` :issue:`368`,
  :issue:`387`.

* Support Python 3.11.
  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>`, :issue:`369`.

* Drop Python 3.7.
  By :user:`John Kirkham <jakirkham>`,, :issue:`405` :issue:`406`.

* Test with zfpy 1.0.0.
  By :user:`John Kirkham <jakirkham>`, :issue:`385`.

* Remove vendored C files and re-generate them on the fly using Cython.
  Add a pyproject.toml file to define Cython as a build dependency.
  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>`, :issue:`369`.

* Update cpuinfo to 9.0.0.
  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>` :issue:`370`.

* Add tests for all registry classes.
  By :user:`Josh Moore <joshmoore>`, :issue:`349`.

* Add workflow to label PRs with "needs release notes".
  By :user:`Saransh Chopra <Saransh-cpp>` :issue:`396`.

* Finish ``pyproject.toml`` migration.
  By :user:`John Kirkham <jakirkham>` :issue:`382`.

* Drop tox.
  By :user:`John Kirkham <jakirkham>`, :issue:`384`.

* Update ReadTheDocs.
  By :user:`John Kirkham <jakirkham>`, :issue:`383`.

* Use `conda-incubator/setup-miniconda@v2.2.0` (and use Conda on Linux).
  By :user:`John Kirkham <jakirkham>` :issue:`398`.

* Bring coverage back up to 100%.
  By :user:`John Kirkham <jakirkham>` and :user:`Martin Durant <martindurant>`,
  :issue:`392` and :issue:`393`.

* Collect coverage on all OSes & enable Codecov.
  By :user:`John Kirkham <jakirkham>`, :issue:`386`, :issue:`388`,
  :issue:`390`, :issue:`391`.

.. _release_0.10.2:

0.10.2
------

Fix
~~~

* Add BitRound (0.10.0) to registry.
  By :user:`Josh Moore <joshmoore>`, :issue:`342`.

.. _release_0.10.1:

0.10.1
------

Maintenance
~~~~~~~~~~~

* Add entrypoints to setup.py.
  By :user:`Josh Moore <joshmoore>`, :issue:`332`.

* Fix spelling.
  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>`, :issue:`336`.

* Drop Python 3.6 from tests
  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>`,
  :issue:`338`, :issue:`339`.

* Remove trailing spaces and empty lines.
  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>`, :issue:`341`.

* Add LGTM.com configuration file
  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>`, :issue:`337`.

.. _release_0.10.0:

0.10.0
------

Enhancements
~~~~~~~~~~~~

* Add support of alternative array classes (other than NumPy arrays)
  By :user:`Mads R. B. Kristensen <madsbk>`, :issue:`305`.

* Add ability to find codecs via entrypoint `numcodecs.codecs`.
  By :user:`Martin Durant <martindurant>`, :issue:`290`.

* Add bitround codec
  By :user:`Ryan Abernathy <rabernat>` and :user:`Martin Durant <martindurant>`, :issue:`298`.

* Introduce a flat option to ensure_contiguous_ndarray to switch off flatten for ZFPY codec
  By :user:`Haiying Xu <halehawk>`, :issue:`307`.

Bug fixes
~~~~~~~~~

* Fix a flatten array error for ZFPY, ZFPY codec is supported on Python 3.9
  and 3.10 on Linux and MacOS, the docs about ZFPY is also available.
  By :user:`Haiying Xu <halehawk>`, :user:`John Kirkham <jakirkham>`,
  :user:`Ryan Abernathey <rabernat>` :issue:`303`.

* Codex: make encode and decode @abstractmethods
  By :user:`Mads R. B. Kristensen <madsbk>`, :issue:`306`.

* Fix expected result test for Shuffle.
  By :user:`Elliott Sales de Andrade <QuLogic>`, :issue:`282`.

Maintenance
~~~~~~~~~~~

* Multiple code linting fixes.
  By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>`,
  :issue:`295`, :issue:`294`, :issue:`293`, and :issue:`292`.

* Drop Python 3.6
  By :user:`Josh Moore <joshmoore>`, :issue:`318`.

* Fix macOS Python 3.10
  By :user:`John Kirkham <jakirkham>`, :issue:`311`.

* chore: bump cibuildwheel version, use action
  By :user:`Henry Schreiner <henryiii>`, :issue:`309`.

* Specify `language` as `'en'` instead of `None`.
  By :user:`John Kirkham <jakirkham>`, :issue:`329`.

* Move `master` to `main`.
  By :user:`John Kirkham <jakirkham>`, :issue:`322`.

* Drop `fastparquet` benchmark.
  By :user:`John Kirkham <jakirkham>`, :issue:`321`.

* Trim wheel builds.
  By :user:`John Kirkham <jakirkham>`, :issue:`320`.

.. _release_0.9.1:

0.9.1
-----

* Fix inaccurate docstrings for Blosc.
  By :user:`James Webber <jamestwebber>`, :issue:`287`.

.. _release_0.9.0:

0.9.0
-----

* c-blosc upgrade 1.18.1 -> 1.21.0.
  Warning: this temporarily removes support for snappy compression!
  By :user:`kindjacket <kindjacket>`, :issue:`283`.

* Fix an ImportError with Blosc on Android.
  By :user:`Daniel Jewell <danieldjewell>`, :issue:`284`.

.. _release_0.8.1:

0.8.1
-----

* Fix an ImportError with Blosc on Android.
  By :user:`Daniel Jewell <danieldjewell>`, :issue:`284`.

.. _release_0.8.0:

0.8.0
-----

* The :class:`numcodecs.zfpy.ZFPY` codec is now supported on Python 3.8 if
  `zfpy==0.5.5 <https://pypi.org/project/zfpy/>`_ is installed.
  By :user:`haiying xu <halehawk>`, :issue:`229`.

* Add support for byte Shuffle filter
  By :user:`Paul Branson <pbranson>` and :user:`Martin Durant <martindurant>` :issue:`273`.

* Update Windows + Mac CI to run all tests.
  By :user:`Jackson Maxfield Brown <JacksonMaxfield>`, :issue:`276`.
  Help from :user:`Oleg Höfling <hoefling>`, :issue:`273`.

* Update cpuinfo to 8.0.0.
  By :user:`Florian Jetter <fjetter>`, :issue:`280`.

* Drop out-of-date manual release docs.
  By :user:`John Kirkham <jakirkham>`, :issue:`272`.

* Add support for Python 3.9 and Update GitHub Actions.

.. _release_0.7.3:

0.7.3
-----

* Add support for Python 3.9 and Update GitHub Actions.
  By :user:`Jackson Maxfield Brown <JacksonMaxfield>`, :issue:`270`.

* Remove support for Python 3.5 which is end of life. While the code base might
  still be compatible; the source dist and wheel are marked as Python 3.6+ and
  pip will not install them. Continuous integration on Python 3.5 has been
  disabled.
  By :user:`Matthias Bussonnier <Carreau>`, :issue:`266` and :issue:`267`.

.. _release_0.7.2:

0.7.2
-----

* Disable avx2 for wheel.
  By :user:`Grzegorz Bokota <Czaki>`, :issue:`253`.

* Add Base64 fixtures.
  By :user:`John Kirkham <jakirkham>`, :issue:`251`.

* Update docs regarding wheels.
  By :user:`Josh Moore <joshmoore>`, :issue:`250`.


.. _release_0.7.1:

0.7.1
-----

* Fix build of wheels.
  By :user:`Grzegorz Bokota <Czaki>`, :issue:`244`.

.. _release_0.7.0:

0.7.0
-----

* Automatically release to PyPI.
  By :user:`Josh Moore <joshmoore>`, :issue:`241`.

* Build wheels on github actions.
  By :user:`Grzegorz Bokota <Czaki>`, :issue:`224`.

* Add Base64 codec.
  By :user:`Trevor Manz <manzt>`, :issue:`176`.

* Add partial decompression of Blosc compressed arrays.
  By :user:`Andrew Fulton <andrewfulton9>`, :issue:`235`.

* Remove LegacyJSON codec.
  By :user:`James Bourbeau  <jrbourbeau>`, :issue:`226`.

* Remove LegacyMsgPack codec.
  By :user:`James Bourbeau  <jrbourbeau>`, :issue:`218`.

* Drop support for Python 2.
  By :user:`James Bourbeau <jrbourbeau>`, :issue:`220`.


.. _release_0.6.4:

0.6.4
-----

* Update Cython to 0.29.14.
  By :user:`John Kirkham <jakirkham>`, :issue:`168`, :issue:`177`, :issue:`204`.

* The bundled c-blosc sources have been upgraded to version 1.17.0.
  This fixes compilation with newer versions of gcc.
  By :user:`Joe Jevnik <llllllllll>`, :issue:`194`.

* Create ``.pep8speaks.yml``. By :user:`Alistair Miles <alimanfoo>`.

* Simplify datetime/timedelta check.
  By :user:`John Kirkham <jakirkham>`, :issue:`170`, :issue:`171`.

* Update URL metadata for PyPI.
  By :user:`Elliott Sales de Andrade <QuLogic>`, :issue:`178`.

* Enable pytest rewriting in test helper functions.
  By :user:`Elliott Sales de Andrade <QuLogic>`, :issue:`185`.

* Rewrites the ``ensure_text`` implementation.
  By :user:`John Kirkham <jakirkham>`, :issue:`201`, :issue:`205`, :issue:`206`.

* Add macOS to CI.
  By :user:`Alistair Miles <alimanfoo>`, :issue:`192`.

* Fix test failures on big-endian systems.
  By :user:`Elliott Sales de Andrade <QuLogic>`, :issue:`186`.

* Use unittest.mock on Python 3.
  By :user:`Elliott Sales de Andrade <QuLogic>`, :issue:`179`.

* Don't mask compile errors in setup.py.
  By :user:`Joe Jevnik <llllllllll>`, :issue:`197`.

* Allow pickles when loading test fixture data.
  By :user:`Elliott Sales de Andrade <QuLogic>`, :issue:`193`.

* Update ``cpuinfo.py``.
  By :user:`John Kirkham <jakirkham>`, :issue:`202`.

* Use ``ensure_text`` in JSON codecs.
  By :user:`John Kirkham <jakirkham>`, :issue:`207`.

* Support Python 3.8.
  By :user:`John Kirkham <jakirkham>`, :issue:`208`.


.. _release_0.6.3:

0.6.3
-----

* Drop support for 32-bit Windows.
  By :user:`Alistair Miles <alimanfoo>`, :issue:`97`, :issue:`156`.

* Raise a ``TypeError`` if an ``object`` array is passed to ``ensure_bytes``.
  By :user:`John Kirkham <jakirkham>`, :issue:`162`.

* Update Cython to 0.29.3.
  By :user:`John Kirkham <jakirkham>`, :issue:`165`.


.. _release_0.6.2:

0.6.2
-----

* Handle (new) buffer protocol conforming types in ``Pickle.decode``.
  By :user:`John Kirkham <jakirkham>`, :issue:`143`, :issue:`150`.

* Use (new) buffer protocol in ``MsgPack`` codec `decode()` method.
  By :user:`John Kirkham <jakirkham>`, :issue:`148`.

* Use (new) buffer protocol in ``JSON`` codec `decode()` method.
  By :user:`John Kirkham <jakirkham>`, :issue:`151`.

* Avoid copying into data in ``GZip``'s `decode()` method on Python 2.
  By :user:`John Kirkham <jakirkham>`, :issue:`152`.

* Revert ndarray coercion of encode returned data.
  By :user:`John Kirkham <jakirkham>`, :issue:`155`.

* The bundled c-blosc sources have been upgraded to version 1.15.0. By
  :user:`Alistair Miles <alimanfoo>` and :user:`John Kirkham <jakirkham>`, :issue:`142`, :issue:`145`.

.. _release_0.6.1:

0.6.1
-----

* Resolved minor issue in backwards-compatibility tests (by :user:`Alistair Miles
  <alimanfoo>`, :issue:`138`, :issue:`139`).


.. _release_0.6.0:

0.6.0
-----

* The encoding format used by the :class:`JSON` and :class:`MsgPack` codecs has been
  changed to resolve an issue with correctly encoding and decoding some object arrays.
  Now the encoded data includes the original shape of the array, which enables the
  correct shape to be restored on decoding. The previous encoding format is still
  supported, so that any data encoded using a previous version of numcodecs can still be
  read. Thus no changes to user code and applications should be required, other
  than upgrading numcodecs. By :user:`Jerome Kelleher <jeromekelleher>`; :issue:`74`,
  :issue:`75`.

* Updated the msgpack dependency (by :user:`Jerome Kelleher <jeromekelleher>`;
  :issue:`74`, :issue:`75`).

* Added support for ppc64le architecture by updating `cpuinfo.py` from upstream (by
  :user:`Anand S <anandtrex>`; :issue:`82`).

* Allow :class:`numcodecs.blosc.Blosc` compressor to run on systems where locks are not present (by
  :user:`Marcus Kinsella <mckinsel>`, :issue:`83`; and :user:`Tom White <tomwhite>`,
  :issue:`93`).

* Drop Python 3.4 (by :user:`John Kirkham <jakirkham>`; :issue:`89`).

* Add Python 3.7 (by :user:`John Kirkham <jakirkham>`; :issue:`92`).

* Add codec :class:`numcodecs.gzip.GZip` to replace ``gzip`` alias for ``zlib``,
  which was incorrect (by :user:`Jan Funke <funkey>`; :issue:`87`; and :user:`John Kirkham <jakirkham>`, :issue:`134`).

* Corrects handling of ``NaT`` in ``datetime64`` and ``timedelta64`` in various
  compressors (by :user:`John Kirkham <jakirkham>`; :issue:`127`, :issue:`131`).

* Improvements to the compatibility layer used for normalising inputs to encode
  and decode methods in most codecs. This removes unnecessary memory copies for
  some codecs, and also simplifies the implementation of some codecs, improving
  code readability and maintainability. By :user:`John Kirkham <jakirkham>` and
  :user:`Alistair Miles <alimanfoo>`; :issue:`119`, :issue:`121`, :issue:`128`.

* Return values from encode() and decode() methods are now returned as numpy
  arrays for consistency across codecs. By :user:`John Kirkham <jakirkham>`,
  :issue:`136`.

* Improvements to handling of errors in the :class:`numcodecs.blosc.Blosc` and
  :class:`numcodecs.lz4.LZ4` codecs when the maximum allowed size of an input
  buffer is exceeded. By :user:`Jerome Kelleher <jeromekelleher>`, :issue:`80`,
  :issue:`81`.


.. _release_0.5.5:

0.5.5
-----

* The bundled c-blosc sources have been upgraded to version 1.14.3 (:issue:`72`).


.. _release_0.5.4:

0.5.4
-----

* The bundled c-blosc sources have been upgraded to version 1.14.0 (:issue:`71`).


.. _release_0.5.3:

0.5.3
-----

* The test suite has been migrated to use pytest instead of nosetests
  (:issue:`61`, :issue:`62`).

* The bundled c-blosc library has been updated to version 1.13.4 (:issue:`63`,
  :issue:`64`).


.. _release_0.5.2:

0.5.2
-----

* Add support for encoding None values in VLen... codecs (:issue:`59`).


.. _release_0.5.1:

0.5.1
-----

* Fixed a compatibility issue with the Zlib codec to ensure it can handle
  bytearray objects under Python 2.7 (:issue:`57`).
* Restricted the :class:`numcodecs.categorize.Categorize` codec to object
  ('O') and unicode ('U') dtypes and disallowed bytes ('S') dtypes because
  these do not round-trip through JSON configuration.


.. _release_0.5.0:

0.5.0
-----

* Added new codecs for encoding arrays with variable-length unicode strings
  (:class:`numcodecs.vlen.VLenUTF8`), variable-length byte strings
  (:class:`numcodecs.vlen.VLenBytes`) and variable-length numerical arrays
  ((:class:`numcodecs.vlen.VLenArray`) (:issue:`56`).


.. _release_0.4.1:

0.4.1
-----

* Resolved an issue where providing an array with dtype ``object`` as the destination
  when decoding could cause segfaults with some codecs (:issue:`55`).


.. _release_0.4.0:

0.4.0
-----

* Added a new :class:`numcodecs.json.JSON` codec as an alternative for encoding of
  object arrays (:issue:`54`).


.. _release_0.3.1:

0.3.1
-----

* Revert the default shuffle argument to SHUFFLE (byte shuffle) for the
  :class:`numcodecs.blosc.Blosc` codec for compatibility and consistency with previous
  code.


.. _release_0.3.0:

0.3.0
-----

* The :class:`numcodecs.blosc.Blosc` codec has been made robust for usage in both
  multithreading and multiprocessing programs, regardless of whether Blosc has been
  configured to use multiple threads internally or not (:issue:`41`, :issue:`42`).

* The :class:`numcodecs.blosc.Blosc` codec now supports an ``AUTOSHUFFLE`` argument
  when encoding (compressing) which activates bit- or byte-shuffle depending on the
  itemsize of the incoming buffer (:issue:`37`, :issue:`42`). This is also now the
  default.

* The :class:`numcodecs.blosc.Blosc` codec now raises an exception when an invalid
  compressor name is provided under all circumstances (:issue:`40`, :issue:`42`).

* The bundled version of the c-blosc library has been upgraded to version 1.12.1
  (:issue:`45`, :issue:`42`).

* An improvement has been made to the system detection capabilities during compilation
  of C extensions (by :user:`Prakhar Goel <newt0311>`; :issue:`36`, :issue:`38`).

* Arrays with datetime64 or timedelta64 can now be passed directly to compressor codecs
  (:issue:`39`, :issue:`46`).


.. _release_0.2.1:

0.2.1
-----

The bundled c-blosc library has been upgraded to version 1.11.3 (:issue:`34`, :issue:`35`).


.. _release_0.2.0:

0.2.0
-----

New codecs:

* The :class:`numcodecs.quantize.Quantize` codec, which provides support for reducing the precision
  of floating-point data, has been ported over from Zarr (:issue:`28`, :issue:`31`).

Other changes:

* The :class:`numcodecs.zlib.Zlib` codec is now also registered under the alias 'gzip'
  (:issue:`29`, :issue:`32`).

Maintenance work:

* A data fixture has been added to the test suite to add some protection against changes to codecs
  that break backwards-compatibility with data encoded using a previous release of numcodecs
  (:issue:`30`, :issue:`33`).


.. _release_0.1.1:

0.1.1
-----

This release includes a small modification to the setup.py script to provide greater control over
how compiler options for different instruction sets are configured (:issue:`24`,
:issue:`27`).


.. _release_0.1.0:

0.1.0
-----

New codecs:

* Two new compressor codecs :class:`numcodecs.zstd.Zstd` and :class:`numcodecs.lz4.LZ4`
  have been added (:issue:`3`, :issue:`22`). These provide direct support for
  compression/decompression using `Zstandard <https://github.com/facebook/zstd>`_ and
  `LZ4 <https://github.com/lz4/lz4>`_ respectively.

* A new :class:`numcodecs.msgpacks.MsgPack` codec has been added which uses
  `msgpack-python <https://github.com/msgpack/msgpack-python>`_ to perform encoding/decoding,
  including support for arrays of Python objects
  (`Jeff Reback <https://github.com/jreback>`_; :issue:`5`, :issue:`6`, :issue:`8`,
  :issue:`21`).

* A new :class:`numcodecs.pickles.Pickle` codec has been added which uses the Python pickle protocol
  to perform encoding/decoding, including support for arrays of Python objects
  (`Jeff Reback <https://github.com/jreback>`_; :issue:`5`, :issue:`6`, :issue:`21`).

* A new :class:`numcodecs.astype.AsType` codec has been added which uses NumPy to perform type
  conversion (`John Kirkham <https://github.com/jakirkham>`_; :issue:`7`, :issue:`12`,
  :issue:`14`).

Other new features:

* The :class:`numcodecs.lzma.LZMA` codec is now supported on Python 2.7 if
  `backports.lzma <https://pypi.python.org/pypi/backports.lzma>`_ is installed
  (`John Kirkham <https://github.com/jakirkham>`_; :issue:`11`, :issue:`13`).

* The bundled c-blosc library has been upgraded to version
  `1.11.2 <https://github.com/Blosc/c-blosc/releases/tag/v1.11.2>`_ (:issue:`10`,
  :issue:`18`).

* An option has been added to the :class:`numcodecs.blosc.Blosc` codec to allow the block size to
  be manually configured (:issue:`9`, :issue:`19`).

* The representation string for the :class:`numcodecs.blosc.Blosc` codec has been tweaked to
  help with understanding the shuffle option (:issue:`4`, :issue:`19`).

* Options have been added to manually control how the C extensions are built regardless of the
  architecture of the system on which the build is run. To disable support for AVX2 set the
  environment variable "DISABLE_NUMCODECS_AVX2". To disable support for SSE2 set the environment
  variable "DISABLE_NUMCODECS_SSE2". To disable C extensions altogether set the environment variable
  "DISABLE_NUMCODECS_CEXT" (:issue:`24`, :issue:`26`).

Maintenance work:

* CI tests now run under Python 3.6 as well as 2.7, 3.4, 3.5 (:issue:`16`, :issue:`17`).

* Test coverage is now monitored via
  `coveralls <https://coveralls.io/github/alimanfoo/numcodecs?branch=master>`_
  (:issue:`15`, :issue:`20`).


.. _release_0.0.1:

0.0.1
-----

Fixed project description in setup.py.


.. _release_0.0.0:

0.0.0
-----

First release. This version is a port of the ``codecs`` module from `Zarr
<https://zarr.readthedocs.io>`_ 2.1.0. The following changes have been made from
the original Zarr module:

* Codec classes have been re-organized into separate modules, mostly one per
  codec class, for ease of maintenance.
* Two new codec classes have been added based on 32-bit checksums:
  :class:`numcodecs.checksum32.CRC32` and :class:`numcodecs.checksum32.Adler32`.
* The Blosc extension has been refactored to remove code duplications related
  to handling of buffer compatibility.