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38 lines
1.4 KiB
38 lines
1.4 KiB
:mod:`uzlib` -- zlib decompression
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==================================
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.. module:: uzlib
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:synopsis: zlib decompression
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|see_cpython_module| :mod:`python:zlib`.
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This module allows to decompress binary data compressed with
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`DEFLATE algorithm <https://en.wikipedia.org/wiki/DEFLATE>`_
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(commonly used in zlib library and gzip archiver). Compression
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is not yet implemented.
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Functions
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---------
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.. function:: decompress(data, wbits=0, bufsize=0)
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Return decompressed *data* as bytes. *wbits* is DEFLATE dictionary window
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size used during compression (8-15, the dictionary size is power of 2 of
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that value). Additionally, if value is positive, *data* is assumed to be
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zlib stream (with zlib header). Otherwise, if it's negative, it's assumed
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to be raw DEFLATE stream. *bufsize* parameter is for compatibility with
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CPython and is ignored.
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.. class:: DecompIO(stream, wbits=0)
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Create a `stream` wrapper which allows transparent decompression of
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compressed data in another *stream*. This allows to process compressed
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streams with data larger than available heap size. In addition to
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values described in :func:`decompress`, *wbits* may take values
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24..31 (16 + 8..15), meaning that input stream has gzip header.
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.. admonition:: Difference to CPython
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:class: attention
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This class is MicroPython extension. It's included on provisional
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basis and may be changed considerably or removed in later versions.
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