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gh-134906: Document CompressionParameter.content_size_flag (#134907)

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* Document CompressionParameter.content_size_flag
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Emma Smith 2025-05-29 21:37:43 -07:00 • committed by GitHub
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Doc/library/compression.zstd.rst
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@ -615,6 +615,24 @@ Advanced parameter control
A value of zero causes the value to be selected automatically.
.. attribute:: content_size_flag
Write the size of the data to be compressed into the Zstandard frame
header when known prior to compressing.
This flag only takes effect under the following two scenarios:
* Calling :func:`compress` for one-shot compression
* Providing all of the data to be compressed in the frame in a single
:meth:`ZstdCompressor.compress` call, with the
:attr:`ZstdCompressor.FLUSH_FRAME` mode.
All other compression calls may not write the size information into the
frame header.
``True`` or ``1`` enable the content size flag while ``False`` or ``0``
disable it.
.. attribute:: checksum_flag
A four-byte checksum using XXHash64 of the uncompressed content is