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_compression.cpython-39.pyc
a �DOg� � @ s: d Z ddlZejZG 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 �$/usr/lib64/python3.9/_compression.py�_check_not_closed s z BaseStream._check_not_closedc C s | � � st�d��d S )NzFile not open for reading)�readable�io�UnsupportedOperationr r r r �_check_can_read s zBaseStream._check_can_readc C s | � � st�d��d S )NzFile not open for writing)�writabler r r r r r �_check_can_write s zBaseStream._check_can_writec C s( | � � st�d��| �� s$t�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 sj e Zd ZdZdd� Zddd�Z� fdd�Zd d � Zd d � Zddd�Z dd� Z e j fdd�Z dd� 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| _|| _|| _| jf i | j��| _|| _d S )NFr ���)�_fp�_eof�_pos�_size�_decomp_factory� _decomp_args� _decompressor�_trailing_error)r �fp�decomp_factory�trailing_error� 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 sx t |��X}|�d��.}| �t|��}||d t|��< W d � n1 sH0 Y W d � n1 sf0 Y t|�S )N�B)� memoryview�cast�read�len)r �b�view� byte_view�datar r r �readintoB s LzDecompressReader.readintor c C s� |dk r| � � S |r| jr dS d }| jjr�| jjp<| j�t�}|sDq�| jf i | j ��| _z| j� ||�}W q� | j y� Y q�Y q�0 n4| jj r�| j�t�}|s�t d��nd}| j� ||�}|r"q�q"|s�d| _| j| _dS | jt|�7 _|S )Nr � zACompressed file ended before the end-of-stream marker was reachedT)�readallr r �eof� unused_datar r- � BUFFER_SIZEr r � decompressr � needs_input�EOFErrorr r r. )r �sizer2 �rawblockr r r r- H s@ �� zDecompressReader.readc C s0 | j �d� d| _d| _| jf i | j��| _d S )Nr F)r �seekr r r r r r r r r �_rewindr s zDecompressReader._rewindc C s� |t jkr nR|t jkr"| j| }n<|t jkrP| jdk rD| �t j�rDq6| j| }ntd� |���|| jk rr| � � n || j8 }|dkr�| �t t j|��}|s�q�|t |�8 }q|| jS )Nr z Invalid value for whence: {}) r �SEEK_SET�SEEK_CURr �SEEK_ENDr r- �DEFAULT_BUFFER_SIZEr �formatr? �minr. )r �offset�whencer2 r r r r> x 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 r3 r- r? r r@ r> rH � __classcell__r r r( r r ! s * r )r r rC r8 �BufferedIOBaser � RawIOBaser r r r r �<module> s
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