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S)zInterface to the libbzip2 compression library.
This module provides a file interface, classes for incremental
(de)compression, and functions for one-shot (de)compression.
BZ2File
BZ2CompressorBZ2Decompressoropencompress
decompressz%Nadeem Vawda )r N)RLock)r r i c @ si e Z d Z d Z d d d d d Z d d Z e d d
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d d Z d d Z d d Z d d d Z d d d! Z d" d# d$ Z d: d& d' Z d; d( d) Z d* d+ Z d< d, d- Z d= d. d/ Z d0 d1 Z d2 d3 Z d4 d5 Z d" d6 d7 Z d8 d9 Z d S)>r a@ A file object providing transparent bzip2 (de)compression.
A BZ2File can act as a wrapper for an existing file object, or refer
directly to a named file on disk.
Note that BZ2File provides a *binary* file interface - data read is
returned as bytes, and data to be written should be given as bytes.
rN c C s t | _ d | _ d | _ t | _ d | _ d | _ | d k rX t j d t
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| _ d | _ d | _ n | d k r d
} t } t | | _ ng | d k rd } t } t | | _ n= | d k r:d } t } t | | _ n t d | f t | t t f rt | | | _ d | _ | | _ n? t | d st | d r| | _ | | _ n t d d S) a3 Open a bzip2-compressed file.
If filename is a str or bytes object, it gives the name
of the file to be opened. Otherwise, it should be a file object,
which will be used to read or write the compressed data.
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'.
buffering is ignored. Its use is deprecated.
If mode is 'w', 'x' or 'a', compresslevel can be a number between 1
and 9 specifying the level of compression: 1 produces the least
compression, and 9 (default) produces the most compression.
If mode is 'r', the input file may be the concatenation of
multiple compressed streams.
NFr r z)Use of 'buffering' argument is deprecatedr
z%compresslevel must be between 1 and 9 r rb wwbxxbaabzInvalid mode: %rTreadwritez1filename must be a str or bytes object, or a file)r r zrb)r zwb)r r )r r )r _lock_fp_closefp _MODE_CLOSED_mode_pos_sizewarningswarnDeprecationWarning
ValueError
_MODE_READr
_decompressor_buffer_buffer_offset _MODE_WRITEr _compressor
isinstancestrbytes
_builtin_openhasattr TypeError)selffilenamemode buffering
compresslevelZ mode_code r6 (/opt/alt/python34/lib64/python3.4/bz2.py__init__+ sL
zBZ2File.__init__c C s | j | j t k r d SzY | j t t f k rA d | _ n4 | j t k ru | j j | j j
d | _ n Wd z | j r | j j n Wd d | _ d | _ t | _ d | _
d | _ XXWd QXd S)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.
NFr r )r r r r% _MODE_READ_EOFr& r) r r r* flushr closer' r( )r1 r6 r6 r7 r; n s"
z
BZ2File.closec C s
| j t k S)z True if this file is closed.)r r )r1 r6 r6 r7 closed s zBZ2File.closedc C s | j | j j S)z3Return the file descriptor for the underlying file.)_check_not_closedr fileno)r1 r6 r6 r7 r> s
zBZ2File.filenoc C s | j o | j j S)z)Return whether the file supports seeking.)readabler seekable)r1 r6 r6 r7 r@ s zBZ2File.seekablec C s | j | j t t f k S)z/Return whether the file was opened for reading.)r= r r% r9 )r1 r6 r6 r7 r? s
zBZ2File.readablec C s | j | j t k S)z/Return whether the file was opened for writing.)r= r r) )r1 r6 r6 r7 writable s
zBZ2File.writablec C s | j r t d n d S)Nz I/O operation on closed file)r< r$ )r1 r6 r6 r7 r= s zBZ2File._check_not_closedc C s5 | j t t f k r1 | j t j d n d S)NzFile not open for reading)r r% r9 r= ioUnsupportedOperation)r1 r6 r6 r7 _check_can_read s
zBZ2File._check_can_readc C s/ | j t k r+ | j t j d n d S)NzFile not open for writing)r r) r= rB rC )r1 r6 r6 r7 _check_can_write s
zBZ2File._check_can_writec C sV | j t t f k r1 | j t j d n | j j sR t j d n d S)Nz3Seeking is only supported on files open for readingz3The underlying file object does not support seeking)r r% r9 r= rB rC r r@ )r1 r6 r6 r7 _check_can_seek s
zBZ2File._check_can_seekc C s | j t k r d Sx | j t | j k r | j j pI | j j t } | s | j j
rw t | _ | j | _ d St
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r t | _ | j | _ d SYq Xn | j j | | _ d | _ q Wd S)NFzACompressed file ended before the end-of-stream marker was reachedr T)r r9 r( lenr' r& unused_datar r _BUFFER_SIZEeofr r EOFErrorr r OSError)r1 Zrawblockr6 r6 r7 _fill_buffer s,
zBZ2File._fill_bufferTc C s | j | j d | _ d | _ g } xJ | j rt | rP | j | j n | j t | j 7_ d | _ q+ W| r d j | Sd S)Nr r )r' r( rM appendr rG join)r1 return_datablocksr6 r6 r7 _read_all s
zBZ2File._read_allc C sC | j | } | t | j k rd | j | j | } | | _ | j t | 7_ | r` | Sd S| j | j d | _ d | _ g } x | d k r+| j r+| t | j k r | j d | } | | _ n | j } d | _ | r| j | n | j t | 7_ | t | 8} q W| r?d j | Sd S)Nr r )r( rG r' r rM rN rO )r1 nrP enddatarQ r6 r6 r7 _read_block s*
zBZ2File._read_blockr c
C sB | j 3 | j | j s$ d S| j | j d SWd QXd 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.
r N)r rD rM r' r( )r1 rS r6 r6 r7 peek s
z BZ2File.peekr c C sQ | j B | j | d k r$ d S| d k r: | j S| j | SWd QXd 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.
r r N)r rD rR rV )r1 sizer6 r6 r7 r s
z BZ2File.readc C s | j | j | d k sE | j t | j k rI | j rI d S| d k r | j | j | j | } | j t | 7_ n( | j | j d } d | _ d | _ | j t | 7_ | SWd QXd S)zRead up to size uncompressed bytes, while trying to avoid
making multiple reads from the underlying stream.
Returns b'' if the file is at EOF.
r r N)r rD r( rG r' rM r )r1 rX rU r6 r6 r7 read1& s
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BZ2File.read1c
C s' | j t j j | | SWd QXd S)z_Read up to len(b) bytes into b.
Returns the number of bytes read (0 for EOF).
N)r rB BufferedIOBasereadinto)r1 br6 r6 r7 r[ A s
zBZ2File.readintoc C s t | t s< t | d s- t d n | j } n | j | j | d k r | j j d | j d } | d k r | j | j | } | | _ | j
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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.
__index__zInteger argument expectedr s
r N)r+ intr/ r0 r] r rD r' findr( r rG rB rZ readline)r1 rX rT liner6 r6 r7 r` I s
zBZ2File.readlinec
C sc t | t s< t | d s- t d n | j } n | j t j j | | SWd QXd S)zRead a list of lines of uncompressed bytes from the file.
size can be specified to control the number of lines read: no
further lines will be read once the total size of the lines read
so far equals or exceeds size.
r] zInteger argument expectedN) r+ r^ r/ r0 r] r rB rZ readlines)r1 rX r6 r6 r7 rb ` s
zBZ2File.readlinesc C s_ | j P | j | j j | } | j j | | j t | 7_ t | SWd QXd S)zWrite a byte string 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.
N)r rE r* r r r r rG )r1 rU Z
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BZ2File.writec
C s' | j t j j | | SWd QXd S)zWrite a sequence of byte strings to the file.
Returns the number of uncompressed bytes written.
seq can be any iterable yielding byte strings.
Line separators are not added between the written byte strings.
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zBZ2File.writelinesc C sG | j j d d t | _ d | _ t | _ d | _ d | _ d S)Nr r ) r seekr% r r r r& r' r( )r1 r6 r6 r7 _rewind s zBZ2File._rewindc C s | j | j | d k r# nm | d k r? | j | } nQ | d k r} | j d k rm | j d d n | j | } n t d | f | | j k r | j n
| | j 8} | j | d d | j SWd QXd S)a Change the file position.
The new position is specified by offset, relative to the
position indicated by whence. 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.
r r r
rP Fz Invalid value for whence: %sN)r rF r r rR r$ rf rV )r1 offsetwhencer6 r6 r7 re s
z BZ2File.seekc C s% | j | j | j SWd QXd S)z!Return the current file position.N)r r= r )r1 r6 r6 r7 tell s
z BZ2File.tellr r r r ) __name__
__module__ __qualname____doc__r8 r; propertyr< r> r@ r? rA r= rD rE rF rM rR rV rW r rY r[ r` rb r rc rf re ri r6 r6 r6 r7 r s4 C
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Open a bzip2-compressed file in binary or text mode.
The filename argument can be an actual filename (a str or bytes
object), or an existing file object to read from or write to.
The mode argument can be "r", "rb", "w", "wb", "x", "xb", "a" or
"ab" for binary mode, or "rt", "wt", "xt" or "at" for text mode.
The default mode is "rb", and the default compresslevel is 9.
For binary mode, this function is equivalent to the BZ2File
constructor: BZ2File(filename, mode, compresslevel). In this case,
the encoding, errors and newline arguments must not be provided.
For text mode, a BZ2File 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 moder r5 )r$ replacer rB
TextIOWrapper)r2 r3 r5 encodingerrorsnewlineZbz_modeZ binary_filer6 r6 r7 r s c C s# t | } | j | | j S)zCompress a block of data.
compresslevel, if given, must be a number between 1 and 9.
For incremental compression, use a BZ2Compressor object instead.
)r r r: )rU r5 compr6 r6 r7 r s c C s g } xv | r~ t } y | j | } Wn t k
rL | rE Pn Yn X| j | | j sr t d n | j } q Wd j | S)zjDecompress a block of data.
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zACompressed data ended before the end-of-stream marker was reachedr )r r rL rN rJ r$ rH rO )rU ZresultsZdecompresr6 r6 r7 r s
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