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3 \nO � @ s� d Z ddlZddlZddlZddlZddlZddlZddlZddlZddddgZ d\Z Z Z Z Zd \ZZd dd�Zdd� ZG dd� d�ZG dd� dej�ZG dd� dej�Zd dd�Zdd� Zdd� Zedkr�e� dS ) z�Functions that read and write gzipped files. The user of the file doesn't have to worry about the compression, but random access is not allowed.� N�GzipFile�open�compress� decompress� � � � � �rb� c C s� d|kr d|krPt d|f ��n0|dk r0t d��|dk r@t d��|dk rPt d��|jdd�}t| tttjf�r|t| ||�}n,t| d �s�t| d �r�td||| �}nt d ��d|kr�t j ||||�S |S dS ) a Open a gzip-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 GzipFile constructor: GzipFile(filename, mode, compresslevel). In this case, the encoding, errors and newline arguments must not be provided. For text mode, a GzipFile object is created, and wrapped in an io.TextIOWrapper instance with the specified encoding, error handling behavior, and line ending(s). �t�bzInvalid mode: %rNz0Argument 'encoding' not supported in binary modez.Argument 'errors' not supported in binary modez/Argument 'newline' not supported in binary mode� �read�writez1filename must be a str or bytes object, or a file) � ValueError�replace� isinstance�str�bytes�os�PathLiker �hasattr� TypeError�io� TextIOWrapper)�filename�mode� compresslevel�encoding�errors�newlineZgz_modeZ binary_file� r# � /usr/lib64/python3.6/gzip.pyr s$ c C s | j tjd|�� d S )Nz<L)r �structZpack)�output�valuer# r# r$ �write32u@ s r( c @ s< e Zd ZdZddd�Zdd� Zddd�Zd d � Zd d � Zd S )� _PaddedFilez�Minimal read-only file object that prepends a string to the contents of an actual file. Shouldn't be used outside of gzip.py, as it lacks essential functionality.� c C s || _ t|�| _|| _d| _d S )Nr )�_buffer�len�_length�file�_read)�self�f�prependr# r# r$ �__init__J s z_PaddedFile.__init__c C s~ | j d kr| jj|�S | j | | jkrJ| j }| j |7 _ | j|| j � S | j }d | _ | j|d � | jj|| j | � S d S )N)r/ r. r r- r+ )r0 �sizer r# r# r$ r P s z_PaddedFile.readc C s> | j d kr|| _n| j t|�8 _ d S t| j�| _d| _ d S )Nr )r/ r+ r, r- )r0 r2 r# r# r$ r2 ] s z_PaddedFile.prependc C s d | _ d | _| jj|�S )N)r/ r+ r. �seek)r0 Zoffr# r# r$ r5 f s z_PaddedFile.seekc C s dS )NTr# )r0 r# r# r$ �seekablek s z_PaddedFile.seekableN)r* )r* ) �__name__� __module__� __qualname__�__doc__r3 r r2 r5 r6 r# r# r# r$ r) E s r) c @ s� e Zd ZdZdZd-dd�Zedd� �Zedd � �Zd d � Z d d � Z dd� Z dd� Z d/dd�Z d1dd�Zdd� Zedd� �Zdd � Zejfd d �Zd d � Zd!d"� Zd#d$� Zd%d&� Zd'd(� Zejfd)d*�Z d3d+d,�Z dS )4r a The GzipFile class simulates most of the methods of a file object with the exception of the truncate() method. This class only supports opening files in binary mode. If you need to open a compressed file in text mode, use the gzip.open() function. Nr c C s2 |r"d|ksd|kr"t dj|���|r6d|kr6|d7 }|dkrTtj||pJd� }| _|dkr|t|dd�}t|ttf�s�d}n t j |�}|dkr�t|d d�}|j d �r�t | _ t|�}tj|�| _|| _nN|j d��rt| _ | j|� tj|tjtj tjd�| _|| _nt dj|���|| _ | j tk�r.| j � dS )aG Constructor for the GzipFile class. At least one of fileobj and filename must be given a non-trivial value. The new class instance is based on fileobj, which can be a regular file, an io.BytesIO object, or any other object which simulates a file. It defaults to None, in which case filename is opened to provide a file object. When fileobj is not None, the filename argument is only used to be included in the gzip file header, which may include the original filename of the uncompressed file. It defaults to the filename of fileobj, if discernible; otherwise, it defaults to the empty string, and in this case the original filename is not included in the header. The mode argument can be any of 'r', 'rb', 'a', 'ab', 'w', 'wb', 'x', or 'xb' depending on whether the file will be read or written. The default is the mode of fileobj if discernible; otherwise, the default is 'rb'. A mode of 'r' is equivalent to one of 'rb', and similarly for 'w' and 'wb', 'a' and 'ab', and 'x' and 'xb'. The compresslevel argument is an integer from 0 to 9 controlling the level of compression; 1 is fastest and produces the least compression, and 9 is slowest and produces the most compression. 0 is no compression at all. The default is 9. The mtime argument is an optional numeric timestamp to be written to the last modification time field in the stream when compressing. If omitted or None, the current time is used. r �UzInvalid mode: {!r}r Nr �namer r �r�w�a�xr )r> r? r@ ) r �format�builtinsr � myfileobj�getattrr r r r �fspath� startswith�READr � _GzipReaderr �BufferedReaderr+ r< �WRITE� _init_write�zlibZ compressobjZDEFLATED� MAX_WBITSZ DEF_MEM_LEVELr � _write_mtime�fileobj�_write_gzip_header)r0 r r r rO �mtime�rawr# r# r$ r3 { s> # zGzipFile.__init__c C sB dd l }|jdtd� | jtkr<| jdd � dkr<| jd S | jS )Nr zuse the name attributer � z.gz���)�warnings�warn�DeprecationWarningr rJ r< )r0 rU r# r# r$ r � s zGzipFile.filenamec C s | j jjS )z0Last modification time read from stream, or None)r+ rR � _last_mtime)r0 r# r# r$ rQ � s zGzipFile.mtimec C s. t | j�}d|dd� d tt| �� d S )Nz<gzip r � �>���)�reprrO �hex�id)r0 �sr# r# r$ �__repr__� s zGzipFile.__repr__c C s. || _ tjd�| _d| _g | _d| _d| _d S )Nr* r )r< rL �crc32�crcr4 Zwritebuf�bufsize�offset)r0 r r# r# r$ rK � s zGzipFile._init_writec C s� | j jd� | j jd� y<tjj| j�}t|t�s<|jd�}|j d�rR|d d � }W n t k rl d}Y nX d}|rzt }| j jt |�jd�� | j }|d kr�tj� }t| j t|�� | j jd� | j jd � |r�| j j|d � d S ) Ns �� zlatin-1s .gzrS r* r � � �� rT )rO r r �path�basenamer< r r �encode�endswith�UnicodeEncodeError�FNAME�chrrN �timer( �int)r0 Zfname�flagsrQ r# r# r$ rP � s, zGzipFile._write_gzip_headerc C s� | j � | jtkr&dd l}t|jd��| jd kr8td��t|t �rLt |�}nt |�}|j }|dkr�| jj | jj|�� | j|7 _tj|| j�| _| j|7 _|S )Nr z$write() on read-only GzipFile objectz!write() on closed GzipFile object)�_check_not_closedr rJ �errno�OSError�EBADFrO r r r r, � memoryview�nbytesr r r4 rL ra rb rd )r0 �datart Zlengthr# r# r$ r � s zGzipFile.writer c C s2 | j � | jtkr&dd l}t|jd��| jj|�S )Nr z$read() on write-only GzipFile object)rs r rG rt ru rv r+ r )r0 r4 rt r# r# r$ r s z GzipFile.readc C s@ | j � | jtkr&ddl}t|jd��|dk r4tj}| jj |�S )zdImplements BufferedIOBase.read1() Reads up to a buffer's worth of data is size is negative.r Nz%read1() on write-only GzipFile object) rs r rG rt ru rv r �DEFAULT_BUFFER_SIZEr+ �read1)r0 r4 rt r# r# r$ r{ s zGzipFile.read1c C s2 | j � | jtkr&dd l}t|jd��| jj|�S )Nr z$peek() on write-only GzipFile object)rs r rG rt ru rv r+ �peek)r0 �nrt r# r# r$ r| # s z GzipFile.peekc C s | j d kS )N)rO )r0 r# r# r$ �closed* s zGzipFile.closedc C s� | j }|d krd S d | _ zP| jtkrR|j| jj� � t|| j� t|| jd@ � n| jt krf| j j � W d | j }|r�d | _ |j � X d S )Nl �� ) rO r rJ r r �flushr( rb r4 rG r+ �closerC )r0 rO rC r# r# r$ r� . s zGzipFile.closec C s4 | j � | jtkr0| jj| jj|�� | jj� d S )N)rs r rJ rO r r r )r0 Z zlib_moder# r# r$ r A s zGzipFile.flushc C s | j j� S )z�Invoke the underlying file object's fileno() method. This will raise AttributeError if the underlying file object doesn't support fileno(). )rO �fileno)r0 r# r# r$ r� H s zGzipFile.filenoc C s" | j tkrtd��| jjd� dS )z[Return the uncompressed stream file position indicator to the beginning of the filezCan't rewind in write moder N)r rG ru r+ r5 )r0 r# r# r$ �rewindP s zGzipFile.rewindc C s | j tkS )N)r rG )r0 r# r# r$ �readableW s zGzipFile.readablec C s | j tkS )N)r rJ )r0 r# r# r$ �writableZ s zGzipFile.writablec C s dS )NTr# )r0 r# r# r$ r6 ] s zGzipFile.seekablec C s� | j tkr�|tjkr2|tjkr*| j| }ntd��|| jk rDtd��|| j }dd }x t|d �D ]}| j |� qdW | j d|d � n | j t kr�| j � | j j ||�S | jS )NzSeek from end not supportedzNegative seek in write moderh i )r rJ r �SEEK_SET�SEEK_CURrd r ru �ranger rG rs r+ r5 )r0 rd �whence�count�chunk�ir# r# r$ r5 ` s z GzipFile.seekc C s | j � | jj|�S )N)rs r+ �readline)r0 r4 r# r# r$ r� t s zGzipFile.readline)NNr NNr[ )r[ r[ )r[ r[ )r[ ) r7 r8 r9 r: rC r3 �propertyr rQ r` rK rP r r r{ r| r~ r� rL Z Z_SYNC_FLUSHr r� r� r� r� r6 r r� r5 r� r# r# r# r$ r n s. H c sZ e Zd Z� fdd�Zdd� Zdd� Zdd� Zdd d �Zd d � Zdd� Z � fdd�Z � Z S )rH c s, t � jt|�tjtj d� d| _d | _d S )N)ZwbitsT)�superr3 r) rL Z decompressobjrM � _new_memberrX )r0 �fp)� __class__r# r$ r3 z s z_GzipReader.__init__c C s t jd�| _d| _d S )Nr* r )rL ra �_crc� _stream_size)r0 r# r# r$ � _init_read� s z_GzipReader._init_readc C sJ | j j|�}x8t|�|k rD| j j|t|� �}|s:td��||7 }qW |S )z�Read exactly *n* bytes from `self._fp` This method is required because self._fp may be unbuffered, i.e. return short reads. zACompressed file ended before the end-of-stream marker was reached)�_fpr r, �EOFError)r0 r} ry r r# r# r$ � _read_exact� s z_GzipReader._read_exactc C s� | j jd�}|dkrdS |dkr,td| ��tjd| jd��\}}| _|dkrVtd��|t@ r|tjd | jd��\}| j|� |t@ r�x | j jd �}| s�|d kr�P q�W |t @ r�x | j jd �}| s�|d kr�P q�W |t @ r�| jd� d S ) Nr r* Fs �zNot a gzipped file (%r)z<BBIxxr zUnknown compression methodz<Hr rh T) r� r ru r% �unpackr� rX �FEXTRArn �FCOMMENT�FHCRC)r0 �magic�method�flagZ extra_lenr_ r# r# r$ �_read_gzip_header� s0 z _GzipReader._read_gzip_headerr c C s� |dk r| j � S |sdS x�| jjr@| j� d| _| jf | j�| _| jrh| j� | j� sb| j | _ dS d| _| j j t j�}| jj||�}| jjdkr�| j j| jj� n | jjdkr�| j j| jj� |dkr�P |dkrtd��qW | j|� | j t|�7 _ |S )Nr r* TFzACompressed file ended before the end-of-stream marker was reached)�readallZ _decompressor�eof� _read_eofr� Z_decomp_factoryZ _decomp_argsr� r� Z_posZ_sizer� r r rz r Zunconsumed_tailr2 Z unused_datar� �_add_read_datar, )r0 r4 �bufZ uncompressr# r# r$ r � s: z_GzipReader.readc C s$ t j|| j�| _| jt|� | _d S )N)rL ra r� r� r, )r0 ry r# r# r$ r� � s z_GzipReader._add_read_datac C s� t jd| jd��\}}|| jkr<tdt|�t| j�f ��n|| jd@ krRtd��d}x|dkrn| jjd�}qXW |r�| jj |� d S )Nz<IIr zCRC check failed %s != %sl �� z!Incorrect length of data producedrh r ) r% r� r� r� ru r] r� r� r r2 )r0 ra Zisize�cr# r# r$ r� � s z_GzipReader._read_eofc s t � j� d| _d S )NT)r� �_rewindr� )r0 )r� r# r$ r� s z_GzipReader._rewindr[ )r[ ) r7 r8 r9 r3 r� r� r� r r� r� r� � __classcell__r# r# )r� r$ rH y s ! 3rH c C s4 t j� }t|d|d��}|j| � W dQ R X |j� S )z�Compress data in one shot and return the compressed string. Optional argument is the compression level, in range of 0-9. �wb)rO r r N)r �BytesIOr r �getvalue)ry r r� r1 r# r# r$ r s c C s$ t tj| �d�� }|j� S Q R X dS )zYDecompress a gzip compressed string in one shot. Return the decompressed string. )rO N)r r r� r )ry r1 r# r# r$ r s c C s> t jdd � } | o | d dk}|r.| dd � } | s8dg} � x�| D ]�}|r�|dkrltddt jjd�}t jj}q�|d d � d kr�td t|�� q@t|d�}t j|d d� d �}n>|dkr�t jj}tdd t jjd�}nt j|d�}t|d d �}x |j d �}|� s�P |j |� q�W |t jjk �r"|j � |t jjk r@|j � q@W d S )Nr r z-d�-r r )r r rO rS z.gzz filename doesn't end in .gz:r� i rT rT ) �sys�argvr �stdin�buffer�stdout�printr\ r rB r r r� )�argsr �argr1 �gr� r# r# r$ �_test s< r� �__main__)r r r r r )r r )r r NNN)r ) r: r% r� rp r rL rB r Z _compression�__all__ZFTEXTr� r� rn r� rG rJ r r( r) Z BaseStreamr ZDecompressReaderrH r r r� r7 r# r# r# r$ �<module> s, +) &