Releases · pycompression/python-isal

Python 3.14 is supported.
Python 3.8 and 3.9 are no longer supported.
Fix an issue where flushing using igzip_threaded caused a gzip end of stream
and started a new gzip stream. In essence creating a concatenated gzip
stream. Now it is in concordance with how single threaded gzip streams
are flushed using Z_SYNC_FLUSH.
Change build backend to setuptools-scm which is more commonly used and
supported.
Include test packages in the source distribution, so source distribution
installations can be verified.
Fix an issue where some tests failed because they ignored PYTHONPATH.
Enable support for free-threading and build free-threaded wheels for
CPython 3.14. Thanks to @lysnikolaou and @ngoldbaum.

Use upstream ISA-L version 2.31.1 which includes patches to make
installation on MacOS ARM64 possible.
Fix a bug where bytes were copied in the wrong order on big endian
architectures. Fixes test failures on s390x.
Enable building on GNU/Hurd platforms.

Fix a bug where flushing files when writing in threaded mode did not work
properly.
Prevent threaded opening from blocking python exit when an error is thrown
in the calling thread.

Include a patched ISA-L version 2.31. The applied patches make compilation
and wheelbuilding on MacOS ARM64 possible.
Fix a bug where READ and WRITE in isal.igzip were inconsistent with the
values in gzip on Python 3.13
Small simplifications to the igzip.compress function, which should lead
to less overhead.

Fix a bug where compression levels for IGzipFile where checked in read mode.
Update statically linked ISA-L release to 2.31.0
Fix an error that occurred in the __close__ function when a threaded
writer was initialized with incorrect parameters.

Fix a bug where a filehandle remained opened when igzip_threaded.open
was used for writing with a wrong compression level.
Fix a memory leak that occurred when an error was thrown for a gzip header
with the wrong magic numbers.
Fix a memory leak that occurred when isal_zlib.decompressobj was given a
wrong wbits value.

Make a special case for threads==1 in igzip_threaded.open for writing
files. This now combines the writing and compression thread for less
overhead.
Maximize time spent outside the GIL for igzip_threaded.open writing.
This has decreased wallclock time significantly.

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