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Edit: chunk.cpython-39.pyc
a �i; � @ s d Z G dd� d�ZdS )a Simple class to read IFF chunks. An IFF chunk (used in formats such as AIFF, TIFF, RMFF (RealMedia File Format)) has the following structure: +----------------+ | ID (4 bytes) | +----------------+ | size (4 bytes) | +----------------+ | data | | ... | +----------------+ The ID is a 4-byte string which identifies the type of chunk. The size field (a 32-bit value, encoded using big-endian byte order) gives the size of the whole chunk, including the 8-byte header. Usually an IFF-type file consists of one or more chunks. The proposed usage of the Chunk class defined here is to instantiate an instance at the start of each chunk and read from the instance until it reaches the end, after which a new instance can be instantiated. At the end of the file, creating a new instance will fail with an EOFError exception. Usage: while True: try: chunk = Chunk(file) except EOFError: break chunktype = chunk.getname() while True: data = chunk.read(nbytes) if not data: pass # do something with data The interface is file-like. The implemented methods are: read, close, seek, tell, isatty. Extra methods are: skip() (called by close, skips to the end of the chunk), getname() (returns the name (ID) of the chunk) The __init__ method has one required argument, a file-like object (including a chunk instance), and one optional argument, a flag which specifies whether or not chunks are aligned on 2-byte boundaries. The default is 1, i.e. aligned. c @ sZ e Zd Zddd�Zdd� Zdd� Zd d � Zd d � Zddd�Zdd� Z ddd�Z dd� Z dS )�ChunkTFc C s� dd l }d| _|| _|r d}nd}|| _|�d�| _t| j�dk rFt�z |�|d |�d��d | _ W n |j y� td �Y n0 |r�| j d | _ d| _ z| j� � | _ W n ttfy� d| _Y n0 d| _d S ) N� F�>�<� �L� T)�struct�closed�align�file�read� chunkname�len�EOFError� unpack_from� chunksize�error� size_read�tell�offset�AttributeError�OSError�seekable)�selfr r Z bigendianZ inclheaderr Zstrflag� r � /usr/lib64/python3.9/chunk.py�__init__4 s, zChunk.__init__c C s | j S )z*Return the name (ID) of the current chunk.)r �r r r r �getnameN s z Chunk.getnamec C s | j S )z%Return the size of the current chunk.)r r r r r �getsizeR s z Chunk.getsizec C s& | j s"z| �� W d| _ nd| _ 0 d S )NT)r �skipr r r r �closeV s z Chunk.closec C s | j rtd��dS )N� I/O operation on closed fileF)r � ValueErrorr r r r �isatty] s z Chunk.isattyr c C sv | j rtd��| js td��|dkr0|| j }n|dkrB|| j }|dk sT|| jkrXt�| j�| j | d� || _dS )z�Seek to specified position into the chunk. Default position is 0 (start of chunk). If the file is not seekable, this will result in an error. r" z cannot seek� � r N) r r# r r r r � RuntimeErrorr �seekr )r �pos�whencer r r r( b s z Chunk.seekc C s | j rtd��| jS )Nr" )r r# r r r r r r u s z Chunk.tell���c C s� | j rtd��| j| jkr dS |dk r2| j| j }|| j| j krN| j| j }| j�|�}| jt|� | _| j| jkr�| jr�| jd@ r�| j�d�}| jt|� | _|S )z�Read at most size bytes from the chunk. If size is omitted or negative, read until the end of the chunk. r" � r r% )r r# r r r r r r )r �size�data�dummyr r r r z s$ �� z Chunk.readc C s� | j rtd��| jrlzD| j| j }| jr:| jd@ r:|d }| j�|d� | j| | _W dS tyj Y n0 | j| jk r�t d| j| j �}| � |�}|slt �qldS )z�Skip the rest of the chunk. If you are not interested in the contents of the chunk, this method should be called so that the file points to the start of the next chunk. r" r% Ni ) r r# r r r r r r( r �minr r )r �nr/ r r r r � s" z Chunk.skipN)TTF)r )r+ ) �__name__� __module__� __qualname__r r r r! r$ r( r r r r r r r r 3 s r N)�__doc__r r r r r �<module> s 2