zlib – zlib decompression functionality

The zlib module allows limited functionality similar to the CPython zlib library. This module allows to decompress binary data compressed with DEFLATE algorithm (commonly used in zlib library and gzip archiver). Compression is not yet implemented.

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zlib.zlib_decompress(data: bytes, wbits: Optional[int] = 0, bufsize: Optional[int] = 0) bytes

Return decompressed data as bytes. wbits is DEFLATE dictionary window size used during compression (8-15, the dictionary size is power of 2 of that value). Additionally, if value is positive, data is assumed to be zlib stream (with zlib header). Otherwise, if it’s negative, it’s assumed to be raw DEFLATE stream.

The wbits parameter controls the size of the history buffer (or “window size”), and what header and trailer format is expected.

Common wbits values:

  • To decompress deflate format, use wbits = -15

  • To decompress zlib format, use wbits = 15

  • To decompress gzip format, use wbits = 31

Parameters
  • data (bytes) – data to be decompressed

  • wbits (int) – DEFLATE dictionary window size used during compression. See above.

  • bufsize (int) – ignored for compatibility with CPython only