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ejjfdd�Zdd�Zdd�ZdS)�RendereraiHelper class for building DNS wire-format messages.

    Most applications can use the higher-level L{dns.message.Message}
    class and its to_wire() method to generate wire-format messages.
    This class is for those applications which need finer control
    over the generation of messages.

    Typical use::

        r = dns.renderer.Renderer(id=1, flags=0x80, max_size=512)
        r.add_question(qname, qtype, qclass)
        r.add_rrset(dns.renderer.ANSWER, rrset_1)
        r.add_rrset(dns.renderer.ANSWER, rrset_2)
        r.add_rrset(dns.renderer.AUTHORITY, ns_rrset)
        r.add_edns(0, 0, 4096)
        r.add_rrset(dns.renderer.ADDTIONAL, ad_rrset_1)
        r.add_rrset(dns.renderer.ADDTIONAL, ad_rrset_2)
        r.write_header()
        r.add_tsig(keyname, secret, 300, 1, 0, '', request_mac)
        wire = r.get_wire()

    @ivar output: where rendering is written
    @type output: BytesIO object
    @ivar id: the message id
    @type id: int
    @ivar flags: the message flags
    @type flags: int
    @ivar max_size: the maximum size of the message
    @type max_size: int
    @ivar origin: the origin to use when rendering relative names
    @type origin: dns.name.Name object
    @ivar compress: the compression table
    @type compress: dict
    @ivar section: the section currently being rendered
    @type section: int (dns.renderer.QUESTION, dns.renderer.ANSWER,
    dns.renderer.AUTHORITY, or dns.renderer.ADDITIONAL)
    @ivar counts: list of the number of RRs in each section
    @type counts: int list of length 4
    @ivar mac: the MAC of the rendered message (if TSIG was used)
    @type mac: string
    Nr�cCsht�|_|dkr tjdd�|_n||_||_||_||_i|_t	|_
ddddg|_|jjd�d|_
dS)a�Initialize a new renderer.

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        @type id: int
        @param flags: the DNS message flags
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        If rendering results in a message greater than I{max_size},
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zRenderer._rollbackcCs&|j|kr"|j|krtjj�||_dS)aZSet the renderer's current section.

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zRenderer._set_sectioncCsz|jt�|jj�}|j|j|j|j�|jjtj	d||��|jj�}||j
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j�|jtd7<dS)aAdd a question to the message.

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zRenderer.add_questioncKsh|j|�|jj�}|j|j|j|jf|�}|jj�}||jkrR|j|�tj	j
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zRenderer.add_rrsetcKsj|j|�|jj�}|j||j|j|jf|�}|jj�}||jkrT|j|�tj	j
�|j||7<dS)a�Add the rdataset to the specified section, using the specified
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        @param payload: The EDNS sender's payload field, which is the maximum
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        @type fudge: int
        @param id: the message id to encode in the tsig signature
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        @param tsig_error: TSIG error code; default is 0.
        @type tsig_error: int
        @param other_data: TSIG other data.
        @type other_data: string
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