diff options
Diffstat (limited to 'Doc/library/lzma.rst')
| -rw-r--r-- | Doc/library/lzma.rst | 41 |
1 files changed, 35 insertions, 6 deletions
diff --git a/Doc/library/lzma.rst b/Doc/library/lzma.rst index b71051da85..054600530b 100644 --- a/Doc/library/lzma.rst +++ b/Doc/library/lzma.rst @@ -110,6 +110,10 @@ Reading and writing compressed files .. versionchanged:: 3.4 Added support for the ``"x"`` and ``"xb"`` modes. + .. versionchanged:: 3.5 + The :meth:`~io.BufferedIOBase.read` method now accepts an argument of + ``None``. + Compressing and decompressing data in memory -------------------------------------------- @@ -221,13 +225,32 @@ Compressing and decompressing data in memory decompress a multi-stream input with :class:`LZMADecompressor`, you must create a new decompressor for each stream. - .. method:: decompress(data) + .. method:: decompress(data, max_length=-1) + + Decompress *data* (a :term:`bytes-like object`), returning + uncompressed data as bytes. Some of *data* may be buffered + internally, for use in later calls to :meth:`decompress`. The + returned data should be concatenated with the output of any + previous calls to :meth:`decompress`. + + If *max_length* is nonnegative, returns at most *max_length* + bytes of decompressed data. If this limit is reached and further + output can be produced, the :attr:`~.needs_input` attribute will + be set to ``False``. In this case, the next call to + :meth:`~.decompress` may provide *data* as ``b''`` to obtain + more of the output. + + If all of the input data was decompressed and returned (either + because this was less than *max_length* bytes, or because + *max_length* was negative), the :attr:`~.needs_input` attribute + will be set to ``True``. - Decompress *data* (a :class:`bytes` object), returning a :class:`bytes` - object containing the decompressed data for at least part of the input. - Some of *data* may be buffered internally, for use in later calls to - :meth:`decompress`. The returned data should be concatenated with the - output of any previous calls to :meth:`decompress`. + Attempting to decompress data after the end of stream is reached + raises an `EOFError`. Any data found after the end of the + stream is ignored and saved in the :attr:`~.unused_data` attribute. + + .. versionchanged:: 3.5 + Added the *max_length* parameter. .. attribute:: check @@ -245,6 +268,12 @@ Compressing and decompressing data in memory Before the end of the stream is reached, this will be ``b""``. + .. attribute:: needs_input + + ``False`` if the :meth:`.decompress` method can provide more + decompressed data before requiring new uncompressed input. + + .. versionadded:: 3.5 .. function:: compress(data, format=FORMAT_XZ, check=-1, preset=None, filters=None) |