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IEEE 64-bit EUI (Extended Unique Indentifier) logic.
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@param addr: An IEEE EUI-64 indentifier in string form.
@return: C{True} if EUI-64 indentifier is valid, C{False} otherwise.
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@param addr: An IEEE EUI-64 indentifier in string form.
@return: An unsigned integer that is equivalent to value represented
by EUI-64 string identifier.
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@param int_val: An unsigned integer.
@param dialect: (optional) a Python class defining formatting options
(Please Note - not currently in use).
@return: An IEEE EUI-64 identifier that is equivalent to unsigned integer.
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@param int_val: the integer to be packed.
@return: a packed string that is equivalent to value represented by an
unsigned integer.
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@param packed_int: a packed string containing an unsigned integer.
It is assumed that string is packed in network byte order.
@return: An unsigned integer equivalent to value of network address
represented by packed binary string.
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