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_compression.cpython-310.pyc
o �?Og1 � @ sB d Z ddlZddlZejZG dd� dej�ZG dd� dej�ZdS )z7Internal classes used by the gzip, lzma and bz2 modules� Nc @ s0 e Zd ZdZdd� Zdd� Zdd� Zdd � Zd S ) � BaseStreamz Mode-checking helper functions.c C s | j rtd��d S )Nz I/O operation on closed file)�closed� ValueError��self� r �3/opt/alt/python310/lib64/python3.10/_compression.py�_check_not_closed s �z BaseStream._check_not_closedc C � | � � s t�d��d S )NzFile not open for reading)�readable�io�UnsupportedOperationr r r r �_check_can_read � �zBaseStream._check_can_readc C r )NzFile not open for writing)�writabler r r r r r �_check_can_write r zBaseStream._check_can_writec C s( | � � s t�d��| �� st�d��d S )Nz3Seeking is only supported on files open for readingz3The underlying file object does not support seeking)r r r �seekabler r r r �_check_can_seek s �zBaseStream._check_can_seekN)�__name__� __module__� __qualname__�__doc__r r r r r r r r r s r c sr e Zd ZdZdd� Zddd�Z� fdd�Zd d � Zd d � Zddd�Z dd� Z dd� Z e j fdd�Zdd� Z� ZS )�DecompressReaderz5Adapts the decompressor API to a RawIOBase reader APIc C s dS )NTr r r r r r $ s zDecompressReader.readabler c K sB || _ d| _d| _d| _|| _|| _| jdi | j��| _|| _d S )NFr ���r )�_fp�_eof�_pos�_size�_decomp_factory� _decomp_args� _decompressor�_trailing_error)r �fpZdecomp_factoryZtrailing_errorZ decomp_argsr r r �__init__' s zDecompressReader.__init__c s d | _ t� �� S �N)r �super�closer �� __class__r r r& ; s zDecompressReader.closec C s | j �� S r$ )r r r r r r r ? s zDecompressReader.seekablec C s� t |��9}|�d��}| �t|��}||d t|��< W d � n1 s$w Y W d � t|�S W d � t|�S 1 s@w Y t|�S )N�B)� memoryview�cast�read�len)r �bZviewZ byte_view�datar r r �readintoB s (� ��zDecompressReader.readintor c C s� |dk r| � � S |r | jrdS d } | jjrA| jjp | j�t�}|s#n<| jdi | j ��| _z | j� ||�}W n$ | j y@ Y n w | jj rR| j�t�}|sQt d��nd}| j� ||�}|r^nq|sjd| _| j| _dS | jt|�7 _|S )Nr � TzACompressed file ended before the end-of-stream marker was reachedr )�readallr r �eofZ unused_datar r, � BUFFER_SIZEr r � decompressr! Z needs_input�EOFErrorr r r- )r �sizer/ Zrawblockr r r r, H sH ��� ��zDecompressReader.readc C s8 g }| � tj� }r|�|� | � tj� }s d�|�S )Nr1 )r, �sys�maxsize�append�join)r Zchunksr/ r r r r2 q s � zDecompressReader.readallc C s0 | j �d� d| _d| _| jdi | j��| _d S )Nr Fr )r �seekr r r r r r r r r �_rewind| s zDecompressReader._rewindc C s� |t jkrn/|t jkr| j| }n$|t jkr.| jdk r(| �t j�r( | �t j�s!| j| }ntd� |���|| jk r?| � � n|| j8 }|dkra| �t t j|��}|sW | jS |t |�8 }|dksH| jS )Nr z Invalid value for whence: {}) r �SEEK_SET�SEEK_CURr �SEEK_ENDr r, �DEFAULT_BUFFER_SIZEr �formatr= �minr- )r �offset�whencer/ r r r r< � s, � ��zDecompressReader.seekc C s | j S )z!Return the current file position.)r r r r r �tell� s zDecompressReader.tell)r )r )r r r r r r# r& r r0 r, r2 r= r r> r< rF � __classcell__r r r' r r ! s ) r ) r r r8 rA r4 �BufferedIOBaser � RawIOBaser r r r r �<module> s