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3 \� � @ 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 �$/usr/lib64/python3.6/_compression.py�_check_not_closed s z BaseStream._check_not_closedc C s | j � stjd��d S )NzFile not open for reading)�readable�io�UnsupportedOperation)r r r r �_check_can_read s zBaseStream._check_can_readc C s | j � stjd��d S )NzFile not open for writing)�writabler r )r r r r �_check_can_write s zBaseStream._check_can_writec C s( | j � stjd��| j� s$tjd��d S )Nz3Seeking is only supported on files open for readingz3The underlying file object does not support seeking)r r r �seekable)r 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 sl e Zd ZdZdd� Zf fdd�Z� fdd�Zdd � Zd d � Zdd d�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.readablec K s> || _ d| _d| _d| _|| _|| _| jf | j�| _|| _d S )NFr � ���)�_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� j� S )N)r �super�close)r )� __class__r r r# ; s zDecompressReader.closec C s | j j� S )N)r r )r r r r r ? s zDecompressReader.seekablec C sP t |��:}|jd��$}| jt|��}||d t|��< W d Q R X W d Q R X t|�S )N�B)� memoryview�cast�read�len)r �bZviewZ byte_view�datar r r �readintoB s $zDecompressReader.readintor c C s� |dk r| j � S | s | jr dS d }x�| jjr�| jjp@| jjt�}|sHP | jf | j �| _y| jj ||�}W q� | j k r� P Y q�X n4| jj r�| jjt�}|s�t d��nd}| jj ||�}|r&P q&W |s�d| _| j| _dS | jt|�7 _|S )Nr � zACompressed file ended before the end-of-stream marker was reachedT)�readallr r �eofZ unused_datar r( � BUFFER_SIZEr r Z decompressr Z needs_input�EOFErrorr r r) )r �sizer+ Zrawblockr r r r( H s> zDecompressReader.readc C s, | j jd� d| _d| _| jf | j�| _d S )Nr F)r �seekr r r r r )r r r r �_rewindr s zDecompressReader._rewindc C s� |t jkr nV|t jkr"| j| }n@|t jkrT| jdk rHx| jt j�rFq8W | j| }ntdj |���|| jk rv| j � n || j8 }x0|dkr�| jt t j|��}|s�P |t |�8 }q�W | jS )Nr z Invalid value for whence: {}) r �SEEK_SET�SEEK_CURr �SEEK_ENDr r( �DEFAULT_BUFFER_SIZEr �formatr4 �minr) )r �offset�whencer+ r r r r3 x s& zDecompressReader.seekc C s | j S )z!Return the current file position.)r )r r r r �tell� s zDecompressReader.tellr )r )r r r r r r! r# r r, r( r4 r r5 r3 r= � __classcell__r r )r$ r r ! s * r )r r r8 r0 �BufferedIOBaser � RawIOBaser r r r r �<module> s
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