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_lzma

This module has no docstring.

Classes

LZMACompressor

LZMACompressor(format=FORMAT_XZ, check=-1, preset=None, filters=None)

Create a compressor object for compressing data incrementally.

format specifies the container format to use for the output. This can
be FORMAT_XZ (default), FORMAT_ALONE, or FORMAT_RAW.

check specifies the integrity check to use. For FORMAT_XZ, the default
is CHECK_CRC64. FORMAT_ALONE and FORMAT_RAW do not support integrity
checks; for these formats, check must be omitted, or be CHECK_NONE.

The settings used by the compressor can be specified either as a
preset compression level (with the 'preset' argument), or in detail
as a custom filter chain (with the 'filters' argument). For FORMAT_XZ
and FORMAT_ALONE, the default is to use the PRESET_DEFAULT preset
level. For FORMAT_RAW, the caller must always specify a filter chain;
the raw compressor does not support preset compression levels.

preset (if provided) should be an integer in the range 0-9, optionally
OR-ed with the constant PRESET_EXTREME.

filters (if provided) should be a sequence of dicts. Each dict should
have an entry for "id" indicating the ID of the filter, plus
additional entries for options to the filter.

For one-shot compression, use the compress() function instead.

compress(self, data, /)

  Provide data to the compressor object.

  Returns a chunk of compressed data if possible, or b'' otherwise.

  When you have finished providing data to the compressor, call the
  flush() method to finish the compression process.

flush(self, /)

  Finish the compression process.

  Returns the compressed data left in internal buffers.

  The compressor object may not be used after this method is called.

LZMADecompressor

Create a decompressor object for decompressing data incrementally.

  format
    Specifies the container format of the input stream.  If this is
    FORMAT_AUTO (the default), the decompressor will automatically detect
    whether the input is FORMAT_XZ or FORMAT_ALONE.  Streams created with
    FORMAT_RAW cannot be autodetected.
  memlimit
    Limit the amount of memory used by the decompressor.  This will cause
    decompression to fail if the input cannot be decompressed within the
    given limit.
  filters
    A custom filter chain.  This argument is required for FORMAT_RAW, and
    not accepted with any other format.  When provided, this should be a
    sequence of dicts, each indicating the ID and options for a single
    filter.

For one-shot decompression, use the decompress() function instead.

decompress(self, /, data, max_length=-1)

  Decompress *data*, returning uncompressed data as bytes.

  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, *self.needs_input* will be set to ``False``. In this case, the next
  call to *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),
  *self.needs_input* will be set to True.

  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 unused_data attribute.

check = <member 'check' of '_lzma.LZMADecompressor' objects>
  ID of the integrity check used by the input stream.

eof = <member 'eof' of '_lzma.LZMADecompressor' objects>
  True if the end-of-stream marker has been reached.

needs_input = <member 'needs_input' of '_lzma.LZMADecompressor' objects>
  True if more input is needed before more decompressed data can be produced.

unused_data = <member 'unused_data' of '_lzma.LZMADecompressor' objects>
  Data found after the end of the compressed stream.

LZMAError

Call to liblzma failed.

with_traceback(...)

  Exception.with_traceback(tb) --
      set self.__traceback__ to tb and return self.

args = <attribute 'args' of 'BaseException' objects>

Functions

is_check_supported

is_check_supported(check_id, /)

  Test whether the given integrity check is supported.

  Always returns True for CHECK_NONE and CHECK_CRC32.

Other members

CHECK_CRC32 = 1

CHECK_CRC64 = 4

CHECK_ID_MAX = 15

CHECK_NONE = 0

CHECK_SHA256 = 10

CHECK_UNKNOWN = 16

FILTER_ARM = 7

FILTER_ARMTHUMB = 8

FILTER_DELTA = 3

FILTER_IA64 = 6

FILTER_LZMA1 = 4611686018427387905

FILTER_LZMA2 = 33

FILTER_POWERPC = 5

FILTER_SPARC = 9

FILTER_X86 = 4

FORMAT_ALONE = 2

FORMAT_AUTO = 0

FORMAT_RAW = 3

FORMAT_XZ = 1

MF_BT2 = 18

MF_BT3 = 19

MF_BT4 = 20

MF_HC3 = 3

MF_HC4 = 4

MODE_FAST = 1

MODE_NORMAL = 2

PRESET_DEFAULT = 6

PRESET_EXTREME = 2147483648