3 [_]@sdZddlZddlZddlZddlZddlmZmZm Z ej dZ ddZ ej dZ ej d Zej d Zd d ZdZddZdS)zIPv6 helper functions.N)xrange binary_type maybe_decodez 0+([0-9a-f]+)cCst|dkrtdtj|}g}d}t|}xN||kr|t|||d}tj|}|dk rh|jd}|j||d7}q0Wd}d}d} d} xNt dD]B}||d kr| r|} | | } | |kr| }| }d} q| s|} d } qW| rd} | | } | |kr| }| }|dkr|dkrf|d ks8|d krf|d d krf|d krHd} nd} | t j j |dd}n,dj |d|ddj |||d}n dj |}|S)zConvert an IPv6 address in binary form to text form. *address*, a ``binary``, the IPv6 address in binary form. Raises ``ValueError`` if the address isn't 16 bytes long. Returns a ``text``. z IPv6 addresses are 16 bytes longrNrF0TZffffz::z::ffff: :)len ValueErrorbinasciihexlifyr _leading_zeromatchgroupappendrdnsipv4 inet_ntoajoin)addresshexchunksilchunkmZ best_startZbest_lenstartZ last_was_zeroendZ current_lenprefixr%-/tmp/pip-build-yz_zf6az/dnspython/dns/ipv6.pyrs^              rs(.*):(\d+\.\d+\.\d+\.\d+)$s::.*s.*::$c Cst|ts|j}|dkrd}tj|}|dk rvttjj|j d}dj |j dj |d|d|d|dj}t j|}|dk r|dd}nt j|}|dk r|dd}|jd }t|}|d krtjjd }g}x|D]}|d kr.|rtjjd }xftdd |dD]}|jdqWqt|} | dkrHtjj| dkrbdd| |}|j|qW|d kr| rtjjd j|}y tj|Stjtfk rtjjYnXdS)zConvert an IPv6 address in text form to binary form. *text*, a ``text``, the IPv6 address in textual form. Returns a ``binary``. s::s0::Nz{}:{:02x}{:02x}:{:02x}{:02x}rr:rFTs0000r0r) isinstancerencode _v4_endingr bytearrayrr inet_atonrformatdecode_colon_colon_start_colon_colon_endsplitr exception SyntaxErrorrrrr unhexlifyError TypeError) textr!brrZ seen_empty canonicalcrlcr%r%r&r0dsT            r0 scCs |jtS)zIs the specified address a mapped IPv4 address? *address*, a ``binary`` is an IPv6 address in binary form. Returns a ``bool``. ) startswith_mapped_prefix)rr%r%r& is_mappedsrDs s )__doc__rerZ dns.exceptionrZdns.ipv4_compatrrrcompilerrr.r3r4r0rCrDr%r%r%r&s C   G