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a d�h� � @ sb d dl Z d dlZd dlmZ d dlmZ G dd� de j�Zdd� Zdd � Z dd d �Z dd d�Z dS )� N)�error)�univc @ sd e Zd ZdZdd� Zdd� Zdd� Zdejfd d �Z dd d �Z e d d� �Z e j dd� �Z dd� ZdS )�CachingStreamWrappera Wrapper around non-seekable streams. Note that the implementation is tied to the decoder, not checking for dangerous arguments for the sake of performance. The read bytes are kept in an internal cache until setting _markedPosition which may reset the cache. c C s || _ t�� | _d| _d S �Nr )�_raw�io�BytesIO�_cache�_markedPosition)�self�raw� r ��/root/rpmbuild/BUILDROOT/imh-python39-modules-3.9.7-92.el8.x86_64/opt/imh-python/lib/python3.9/site-packages/pyasn1/codec/streaming.py�__init__ s z CachingStreamWrapper.__init__c C s$ | � |�}| j�t|� tj� |S �N)�readr �seek�len�os�SEEK_CUR)r �n�resultr r r �peek s zCachingStreamWrapper.peekc C s dS )NTr �r r r r �seekable! s z CachingStreamWrapper.seekable���c C s | j �||�S r )r r )r r �whencer r r r $ s zCachingStreamWrapper.seekc C sH | j �|�}|dkr(|t|�8 }|s(|S | j�|�}| j �|� || S )Nr )r r r r �write)r r Zread_from_cacheZ read_from_rawr r r r ( s zCachingStreamWrapper.readc C s | j S )a Position where the currently processed element starts. This is used for back-tracking in SingleItemDecoder.__call__ and (indefLen)ValueDecoder and should not be used for other purposes. The client is not supposed to ever seek before this position. )r r r r r �markedPosition5 s z#CachingStreamWrapper.markedPositionc C s2 || _ | j�� tjkr.t�| j�� �| _d| _ d S r )r r �tellr �DEFAULT_BUFFER_SIZEr r )r �valuer r r r ? s c C s | j �� S r )r r r r r r r M s zCachingStreamWrapper.tellN)r )�__name__� __module__� __qualname__�__doc__r r r r �SEEK_SETr r �propertyr �setterr r r r r r s r c C s� t | tj�r| S t | t�r$t�| �S t | tj�r>t�| �� �S z | �� rN| W S t| �W S W n( t y� t � d| j j d ��Y n0 dS )ai Convert object to seekable byte-stream. Parameters ---------- substrate: :py:class:`bytes` or :py:class:`io.IOBase` or :py:class:`univ.OctetString` Returns ------- : :py:class:`io.IOBase` Raises ------ : :py:class:`~pyasn1.error.PyAsn1Error` If the supplied substrate cannot be converted to a seekable stream. zCannot convert z to a seekable bit stream.N)� isinstancer r �bytesr Z OctetStringZasOctetsr r �AttributeErrorr ZUnsupportedSubstrateError� __class__r" )� substrater r r �asSeekableStreamQ s ��r. c c sz t | tj�rD| �� }| �dtj� | �� |k}| �|tj� |V n2| �d�}|du r\dV |rn| �dtj � | V dS )a Check whether we have reached the end of a stream. Although it is more effective to read and catch exceptions, this function Parameters ---------- substrate: :py:class:`IOBase` Stream to check Returns ------- : :py:class:`bool` r � Nr ) r) r r r r r �SEEK_ENDr& r r )r- �cpr �receivedr r r � isEndOfStreamv s r3 r c c s| t | d�r>| �|�}|du r"dV t|�|k r6dV q"|V n:| �� }z$t| |�D ] }|V qRW | �|� n | �|� 0 dS )a? Peek into stream. Parameters ---------- substrate: :py:class:`IOBase` Stream to read from. size: :py:class:`int` How many bytes to peek (-1 = all available) Returns ------- : :py:class:`bytes` or :py:class:`str` The return type depends on Python major version r N)�hasattrr r r �readFromStreamr )r- �sizer2 �current_position�chunkr r r �peekIntoStream� s r9 c c sz | � |�}|du r"tj|d�V q |s<|dkr<tj|d��q t|�|k rp| �t|� tj� tj|d�V q qpq |V dS )a Read from the stream. Parameters ---------- substrate: :py:class:`IOBase` Stream to read from. Keyword parameters ------------------ size: :py:class:`int` How many bytes to read (-1 = all available) context: :py:class:`dict` Opaque caller context will be attached to exception objects created by this function. Yields ------ : :py:class:`bytes` or :py:class:`str` or :py:class:`SubstrateUnderrunError` Read data or :py:class:`~pyasn1.error.SubstrateUnderrunError` object if no `size` bytes is readily available in the stream. The data type depends on Python major version Raises ------ : :py:class:`~pyasn1.error.EndOfStreamError` Input stream is exhausted N)�contextr )r r ZSubstrateUnderrunErrorZEndOfStreamErrorr r r r )r- r6 r: r2 r r r r5 � s r5 )r )r N) r r Zpyasn1r Z pyasn1.typer �IOBaser r. r3 r9 r5 r r r r �<module> s D%! $
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