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d1d&d2d&d&d&d&d&d-d.d!Zed3d&d&fd/d"Zed&d&fd0d#Zd&S )4aS Interface to the liblzma compression library.
This module provides a class for reading and writing compressed files,
classes for incremental (de)compression, and convenience functions for
one-shot (de)compression.
These classes and functions support both the XZ and legacy LZMA
container formats, as well as raw compressed data streams.
Z
CHECK_NONEZ CHECK_CRC32Z CHECK_CRC64Z CHECK_SHA256Z CHECK_ID_MAXZ
CHECK_UNKNOWNZ FILTER_LZMA1Z FILTER_LZMA2Z FILTER_DELTAZ
FILTER_X86Z FILTER_IA64Z
FILTER_ARMZFILTER_ARMTHUMBZFILTER_POWERPCZ FILTER_SPARC FORMAT_AUTO FORMAT_XZZ FORMAT_ALONEZ
FORMAT_RAWZMF_HC3ZMF_HC4ZMF_BT2ZMF_BT3ZMF_BT4Z MODE_FASTZ MODE_NORMALZPRESET_DEFAULTZPRESET_EXTREMELZMACompressorLZMADecompressorLZMAFile LZMAErroropencompress
decompressZis_check_supported N)*)_encode_filter_properties_decode_filter_properties c @ s e Zd ZdZd"dd#dddddZdd Zed
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d)ddZd+ddZd d Zejfd d Zd d! ZdS ),r a@ A file object providing transparent LZMA (de)compression.
An LZMAFile can act as a wrapper for an existing file object, or
refer directly to a named file on disk.
Note that LZMAFile provides a *binary* file interface - data read
is returned as bytes, and data to be written must be given as bytes.
Nrr )formatcheckpresetfiltersc C s& d| _ d| _t| _|dkrL|dkr*td|dk r:td|dkrFt}t}n@|dkr~|dkr`t}t}t ||||d| _
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|tttjfrd|kr|d7 }tj||| _ d| _|| _n*t|dst|dr|| _ || _ntd| jtkr"tj| j tt||d}tj|| _ dS )a Open an LZMA-compressed file in binary mode.
filename can be either an actual file name (given as a str,
bytes, or PathLike object), in which case the named file is
opened, or it can be an existing file object to read from or
write to.
mode can be "r" for reading (default), "w" for (over)writing,
"x" for creating exclusively, or "a" for appending. These can
equivalently be given as "rb", "wb", "xb" and "ab" respectively.
format specifies the container format to use for the file.
If mode is "r", this defaults to FORMAT_AUTO. Otherwise, the
default is FORMAT_XZ.
check specifies the integrity check to use. This argument can
only be used when opening a file for writing. 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.
When opening a file for reading, the *preset* argument is not
meaningful, and should be omitted. The *filters* argument should
also be omitted, except when format is FORMAT_RAW (in which case
it is required).
When opening a file for writing, 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 ID of the filter, plus
additional entries for options to the filter.
NFr rbr zACannot specify an integrity check when opening a file for readingzICannot specify a preset compression level when opening a file for readingwwbaabxxb)r r r r r
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isinstancestrbytesosPathLikebuiltinsr hasattr TypeError _compressionZDecompressReaderr r ioBufferedReader_buffer) selffilenamemoder r r r Z mode_coderaw r9 /usr/lib64/python3.6/lzma.py__init__1 sB ,
zLZMAFile.__init__c C s | j tkrdS zB| j tkr,| jj d| _n"| j tkrN| jj| jj d| _W dz| j
rd| jj W dd| _d| _
t| _ X X dS )zFlush and close the file.
May be called more than once without error. Once the file is
closed, any other operation on it will raise a ValueError.
NF) r# r" r% r4 closer& r r r' flushr! )r5 r9 r9 r: r< s
zLZMAFile.closec C s
| j tkS )z True if this file is closed.)r# r" )r5 r9 r9 r: closed s zLZMAFile.closedc C s | j | jj S )z3Return the file descriptor for the underlying file.)_check_not_closedr fileno)r5 r9 r9 r: r@ s zLZMAFile.filenoc C s | j o| jj S )z)Return whether the file supports seeking.)readabler4 seekable)r5 r9 r9 r: rB s zLZMAFile.seekablec C s | j | jtkS )z/Return whether the file was opened for reading.)r? r# r% )r5 r9 r9 r: rA s zLZMAFile.readablec C s | j | jtkS )z/Return whether the file was opened for writing.)r? r# r& )r5 r9 r9 r: writable s zLZMAFile.writablec C s | j | jj|S )zReturn buffered data without advancing the file position.
Always returns at least one byte of data, unless at EOF.
The exact number of bytes returned is unspecified.
)_check_can_readr4 peek)r5 sizer9 r9 r: rE s z
LZMAFile.peekc C s | j | jj|S )zRead up to size uncompressed bytes from the file.
If size is negative or omitted, read until EOF is reached.
Returns b"" if the file is already at EOF.
)rD r4 r )r5 rF r9 r9 r: r s z
LZMAFile.readc C s" | j |dk rtj}| jj|S )zRead up to size uncompressed bytes, while trying to avoid
making multiple reads from the underlying stream. Reads up to a
buffer's worth of data if size is negative.
Returns b"" if the file is at EOF.
r
)rD r2 DEFAULT_BUFFER_SIZEr4 read1)r5 rF r9 r9 r: rH s zLZMAFile.read1c C s | j | jj|S )a
Read a line of uncompressed bytes from the file.
The terminating newline (if present) is retained. If size is
non-negative, no more than size bytes will be read (in which
case the line may be incomplete). Returns b'' if already at EOF.
)rD r4 readline)r5 rF r9 r9 r: rI s zLZMAFile.readlinec C s: | j | jj|}| jj| | jt|7 _t|S )zWrite a bytes object to the file.
Returns the number of uncompressed bytes written, which is
always len(data). Note that due to buffering, the file on disk
may not reflect the data written until close() is called.
)Z_check_can_writer' r r r r( len)r5 dataZ
compressedr9 r9 r: r s
zLZMAFile.writec C s | j | jj||S )a Change the file position.
The new position is specified by offset, relative to the
position indicated by whence. Possible values for whence are:
0: start of stream (default): offset must not be negative
1: current stream position
2: end of stream; offset must not be positive
Returns the new file position.
Note that seeking is emulated, so depending on the parameters,
this operation may be extremely slow.
)Z_check_can_seekr4 seek)r5 offsetwhencer9 r9 r: rL s z
LZMAFile.seekc C s" | j | jtkr | jj S | jS )z!Return the current file position.)r? r# r% r4 tellr( )r5 r9 r9 r: rO s
z
LZMAFile.tell)Nr r r )r r )r r )r r )r )__name__
__module__ __qualname____doc__r; r< propertyr> r@ rB rA rC rE r rH rI r r2 SEEK_SETrL rO r9 r9 r9 r: r & s T
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S dS )
a Open an LZMA-compressed file in binary or text mode.
filename can be either an actual file name (given as a str, bytes,
or PathLike object), in which case the named file is opened, or it
can be an existing file object to read from or write to.
The mode argument can be "r", "rb" (default), "w", "wb", "x", "xb",
"a", or "ab" for binary mode, or "rt", "wt", "xt", or "at" for text
mode.
The format, check, preset and filters arguments specify the
compression settings, as for LZMACompressor, LZMADecompressor and
LZMAFile.
For binary mode, this function is equivalent to the LZMAFile
constructor: LZMAFile(filename, mode, ...). In this case, the
encoding, errors and newline arguments must not be provided.
For text mode, an LZMAFile object is created, and wrapped in an
io.TextIOWrapper instance with the specified encoding, error
handling behavior, and line ending(s).
tr zInvalid mode: %rNz0Argument 'encoding' not supported in binary modez.Argument 'errors' not supported in binary modez/Argument 'newline' not supported in binary mode )r r r r )r$ replacer r2
TextIOWrapper) r6 r7 r r r r rV rW rX Zlz_modeZ binary_filer9 r9 r: r s
c C s t ||||}|j| |j S )zCompress a block of data.
Refer to LZMACompressor's docstring for a description of the
optional arguments *format*, *check*, *preset* and *filters*.
For incremental compression, use an LZMACompressor instead.
)r r r= )rK r r r r compr9 r9 r: r 6 s c C sr g }xbt |||}y|j| }W n tk
r> |r8P n Y nX |j| |jsXtd|j} | sP qW dj|S )zDecompress a block of data.
Refer to LZMADecompressor's docstring for a description of the
optional arguments *format*, *check* and *filters*.
For incremental decompression, use an LZMADecompressor instead.
zACompressed data ended before the end-of-stream marker was reached )r r r appendeofZ unused_datajoin)rK r Zmemlimitr ZresultsZdecompresr9 r9 r: r B s
)r r r )rS __all__r. r2 r, Z_lzmar r
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