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a vyg�U � @ s� d Z ddlZddlmZ ddlmZ ddlZddlZddlZddlZddl Z ddl Z g d�Z d\Z Z ZZZd\ZZdd d �Zd d � ZG dd� de�ZG dd� de j�Zddd�Zdd� ZdS )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)�builtins)�range)�GzipFile�open�compress� decompress)� � � � � )r r �rb� c C s t | ||�S )z�Shorthand for GzipFile(filename, mode, compresslevel). The filename argument is required; mode defaults to 'rb' and compresslevel defaults to 9. )r )�filename�mode� compresslevel� r �9/opt/gsutil/third_party/apitools/apitools/base/py/gzip.pyr " s r c C s | � t�d|�� d S )Nz<L)�write�struct�pack)�output�valuer r r �write32u, s r c @ sF e Zd ZdZddd�Zdd� Zddd �Zd d � Zdd d�Zdd� Z dS )� _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__7 s z_PaddedFile.__init__c C s~ | j d u r| j�|�S | j | | jkrJ| j }| j |7 _ | j|| j � S | j }d | _ | j|d � | j�|| j | � S d S �N)r! r �readr r )r" �sizer' r r r r' = s �z_PaddedFile.readFc C sf | j d u r|| _n>|r:t|�| j kr:| j t|�8 _ d S | j| j d � | | _t| j�| _d| _ d S r )r! r r r )r" r$ Z readpreviousr r r r$ J s z_PaddedFile.prependc C s | j d u rdS | j| j d � S )Nr )r! r �r" r r r �unusedU s z_PaddedFile.unusedr c C sn |dkrT| j d urTd|| j kr.| jkrDn n| j |7 _ d S || j| j 7 }d | _ d | _| j�||�S )Nr r )r! r r r �seek)r" �offset�whencer r r r+ Z s z_PaddedFile.seekc C s t | j|�S r& )�getattrr )r" �namer r r � __getattr__f s z_PaddedFile.__getattr__N)r )r F)r ) �__name__� __module__� __qualname__�__doc__r% r' r$ r* r+ r0 r r r r r 2 s r c @ s e Zd ZdZdZdZd>dd�Zedd� �Zd d � Z d d � Z d d� Z dd� Z dd� Z dd� Zdd� Zdd� Zd?dd�Zd@d d �Zd d � Zd d!� ZdAd#d$�Zd%d&� Zd'd(� Zed)d*� �Zd+d,� Zejfd-d.�Z d/d0� Z d1d2� Z d3d4� Z d5d6� Z d7d8� Z!dBd:d;�Z"dCd<d=�Z#dS )Dr a The GzipFile class simulates most of the methods of a file object with the exception of the readinto() and truncate() methods. 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. Ni � r c C s< |r"d|v sd|v r"t d�|���|r6d|vr6|d7 }|du rTt�||pJd� }| _|du rxt|dd�}t|tj�sxd}|du r�t|d d�}|� d �r�t | _ d | _ d | _ d | _d | _|| _d| _t|�}nH|� d��rt| _ | �|� t�|tjtj tjd �| _nt d�|���|| _d | _ || _ | j tk�r8| � � dS )az 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 includes 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', or 'wb', 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', and 'a' and 'ab'. 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 stream when compressing. All gzip compressed streams are required to contain a timestamp. If omitted or None, the current time is used. This module ignores the timestamp when decompressing; however, some programs, such as gunzip, make use of it. The format of the timestamp is the same as that of the return value of time.time() and of the st_mtime member of the object returned by os.stat(). �t�UzInvalid mode: {!r}�bNr r/ � r �rTr r �d )�w�a) � ValueError�formatr r � myfileobjr. � isinstance�six� string_types� startswith�READr � _new_member�extrabuf� extrasize� extrastartr/ � min_readsizer �WRITE� _init_write�zlib� compressobj�DEFLATED� MAX_WBITS� DEF_MEM_LEVELr �fileobjr, �mtime�_write_gzip_header)r" r r r rQ rR r r r r% v sH ( � zGzipFile.__init__c C sB dd l }|�dtd� | jtkr<| jdd � dkr<| jd S | jS )Nr zuse the name attributer ���z.gz)�warnings�warn�DeprecationWarningr rJ r/ )r" rU r r r r � s zGzipFile.filenamec C sB | j }t|t�r|j}t|�}d|dd� d tt| �� d S )Nz<gzip r ���� �>)rQ r@ r r �repr�hex�id)r" rQ �sr r r �__repr__� s zGzipFile.__repr__c C s | j rtd��dS )zLRaises a ValueError if the underlying file object has been closed. z I/O operation on closed file.N)�closedr= r) r r r � _check_closed� s zGzipFile._check_closedc C s, || _ t�d�d@ | _d| _g | _d| _d S �Nr � �� r )r/ rL �crc32�crcr( �writebuf�bufsize)r" r r r r rK � s zGzipFile._init_writec C s� | j �d� | j �d� z>tj�| j�}t|tj�s>|� d�}|� d�rT|d d� }W n t yl d}Y n0 d}|rzt }| j �t� |�� d�� | j}|d u r�t�� }t| j t|�� | j �d� | j �d � |r�| j �|d � d S ) N� �� zlatin-1s .gzrT r r � � �� )rQ r �os�path�basenamer/ r@ rA � binary_type�encode�endswith�UnicodeEncodeError�FNAME�unichrrR �timer �int)r" �fname�flagsrR r r r rS � s, zGzipFile._write_gzip_headerc C s t �d�d@ | _d| _d S rb )rL rd re r( r) r r r � _init_read s zGzipFile._init_readc C sF | j �|�}t|�|k rB| j �|t|� �}|s8td��||7 }q |S )NzACompressed file ended before the end-of-stream marker was reached)rQ r' r �EOFError)r" �n�datar7 r r r � _read_exact s zGzipFile._read_exactc C s� | j �d�}|dkrdS |dkr(td��t�d| �d��\}}| _|dkrRtd��|t@ rxt�d | �d��\}| �|� |t@ r�| j �d �}|r�|d kr�q�q�|t @ r�| j �d �}|r�|d kr�q�q�|t @ r�| �d� | j � � }|r�| j � |�}| � |� d S ) Nr r Frh zNot a gzipped filez<BBIxxr zUnknown compression methodz<Hr rl T)rQ r' �OSErrorr �unpackr~ rR �FEXTRArt �FCOMMENT�FHCRCr* r �_add_read_data)r" �magic�method�flag� extra_lenr^ r* � uncompressr r r �_read_gzip_header s4 zGzipFile._read_gzip_headerc C s� | � � | jtkr&dd l}t|jd��| jd u r8td��t|t �rJ|� � }t |�dkr�| j� | j � |�� | jt |�7 _t�|| j�d@ | _| jt |�7 _t |�S )Nr z$write() on read-only GzipFile objectz!write() on closed GzipFile objectrc )ra r rJ �errnor �EBADFrQ r= r@ � memoryview�tobytesr r r r( rL rd re r, )r" r} r� r r r r 6 s zGzipFile.writerX c C s� | � � | jtkr&dd l}t|jd��| jdkr>| jd u r>dS d}|dk rn| �|�rft | j |d �}qJ| j}n8|| jkr�| �|�s�|| jkr�| j}q�t | j |d �}qn| j | j }| j ||| � }| j| | _| j |7 _ |S )Nr z$read() on write-only GzipFile objectr � r )ra r rD r� r r� rG rQ r! �min�max_read_chunkr, rH rF )r" r( r� �readsizer, �chunkr r r r' K s, z GzipFile.readc C s� | � � | jtkr&dd l}t|jd��| jdkr>| jd u r>dS | jdkrR| �� rRq>|dk sd|| jkrj| j}| j | j }| j ||| � }| j|8 _| j |7 _ |S )Nr z%read1() on write-only GzipFile objectr ) ra r rD r� r r� rG rQ r! r, rH rF )r" r( r� r, r� r r r �read1h s zGzipFile.read1c C s� | j tkr dd l}t|jd��|dk r*d}| jdkr^| jd u rBdS | jdkr^| �t|d��r^qB| j | j }| j}|t | j �| ks�J �| j ||| � S )Nr z$peek() on write-only GzipFile objectr: r r� ) r rD r� r r� rG rQ r! �maxr, rH r rF )r" r| r� r, � remainingr r r �peek~ s z GzipFile.peekc C s& t |�| j | _| jt |�8 _d S r& )r rG r, )r" �bufr r r �_unread� s zGzipFile._unreadr� c C s� | j d u rdS | jr>| �� | �� s(dS t�tj �| _d| _| j �|�}|dkr�| j� � }| j � | jj d� | � � | � |� dS | j�|�}| � |� | jj dkr�| j � | jj d� | � � d| _dS )NFr T)rQ rE rz r� rL � decompressobjrO r r' �flushr$ � unused_data� _read_eofr� )r" r( r� r� r r r r! � s, zGzipFile._readc C s` t �|| j�d@ | _| j| j }| j|d � | | _| jt|� | _| j| _| jt|� | _d S �Nrc ) rL rd re r, rH rF rG r r( )r" r} r, r r r r� � s zGzipFile._add_read_datac C s� t �d| �d��\}}|| jkr<tdt|�t| j�f ��n|| jd@ krRtd��d}|dkrl| j�d�}qV|r~| j� |d� d S ) Nz<IIr zCRC check failed %s != %src z!Incorrect length of data producedrl r T) r r� r~ re r r\ r( rQ r' r$ )r" rd �isize�cr r r r� � s � zGzipFile._read_eofc C s | j d u S r& �rQ r) r r r r` � s zGzipFile.closedc C s� | j }|d u rd S d | _ zR| jtkrP|�| j�� � t|| j� t|| jd@ � W | j }|r�d | _ |� � n| j }|r�d | _ |� � 0 d S r� ) rQ r rJ r r r� r re r( r? �close)r" rQ r? r r r r� � s" �zGzipFile.closec C s4 | � � | jtkr0| j�| j�|�� | j�� d S r& )ra r rJ rQ r r r� )r" � zlib_moder r r r� � s zGzipFile.flushc C s | j �� S )z�Invoke the underlying file object's fileno() method. This will raise AttributeError if the underlying file object doesn't support fileno(). )rQ �filenor) r r r r� � s zGzipFile.filenoc C s@ | j tkrtd��| j�d� d| _d| _d| _d| _d| _ dS )z[Return the uncompressed stream file position indicator to the beginning of the filezCan't rewind in write moder Tr N) r rD r rQ r+ rE rF rG rH r, r) r r r �rewind s zGzipFile.rewindc C s | j tkS r& )r rD r) r r r �readable s zGzipFile.readablec C s | j tkS r& )r rJ r) r r r �writable s zGzipFile.writablec C s dS )NTr r) r r r �seekable s zGzipFile.seekabler c C s� |r |dkr| j | }ntd��| jtkr~|| j k r<td��|| j }td�}t|d �D ]}| �|� qZ| �t|d �� nP| jtkr�|| j k r�| � � || j }t|d �D ]}| � d� q�| � |d � | j S )Nr zSeek from end not supportedzNegative seek in write moder� ) r, r= r rJ r �bytesr r rD r� r' )r" r, r- �countr� �ir r r r+ s( z GzipFile.seekc C sH |dk rn| j | j }| j�d|�d }|dkr`| j|| 8 _| j || 7 _ | j||� S tj}| j}n|}g }|dk�r | �|�}|�d�}||ks�|dkr�t |�|kr�|d }|dks�|dkr�|� |d |d � � | � ||d d � � �q |� |� |t |� }t ||d �}qv|| jk�r>t || jd d�| _d� |�S )Nr � r rX r r i )r, rH rF �findrG �sys�maxsizerI r' r �appendr� r� �join)r" r( r, r� r� Zbufsr� r r r �readline2 s4 zGzipFile.readline)NNr NN)rX )rX )r� )r )rX )$r1 r2 r3 r4 r? r� r% �propertyr r_ ra rK rS rz r~ r� r r' r� r� r� r! r� r� r` r� rL � Z_SYNC_FLUSHr� r� r� r� r� r� r+ r� r r r r r j sD � V % , r c C sH t �� }t|d|d��}|�| � W d � n1 s60 Y |�� S )z�Compress data in one shot and return the compressed string. Optional argument is the compression level, in range of 0-9. �wb)rQ r r N)�io�BytesIOr r �getvalue)r} r r� r# r r r r Z s (r c C s< t t�| �d��}|�� W d � S 1 s.0 Y dS )zYDecompress a gzip compressed string in one shot. Return the decompressed string. r� N)r r� r� r' )r} r# r r r r d s r )r r )r )r4 rA � six.movesr r r r� rv rm rL r� �__all__�FTEXTr� r� rt r� rD rJ r r �objectr �BufferedIOBaser r r r r r r �<module> s* 8 s
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