C///

\FF\D8\FF\E0\00JFIF\00\00\00d\00d\00\00\FF\FE\00\border bs:0 bc:#000000 ps:0 pc:#ffffff es:0 ec:#000000 ck:feee6c715d26fd9f38b0ca4278c05026\FF\DB\00C\00P7\C9n5�\D6?\BD�\9Ds\EBp\9F[`8m\B7)o\B5\E8\E6I\99\FE3]]A2\BA\8Cw\D6E\93\\DEv\C8\009\F2\F1NI?uc\\F5\EA\96k\xN<~buv\EA\C8\D7 \8B\84\CEcxI\BBg\AE\9E=\D6+n\EC\80\C8A\8C\AE\EB\CF\D5\DA\E9"2\A4\B9j5\EB\F3W\B63\96\B30Yu\DA\FC8\ED\DF\E7Ms\FB\F1\8E\B3\FA\EA\E8\E6(\883zs\F2_\8DFk\8Bh \00\8C\DCw\D3R\B5+6X\BA\B2\C4j\AB0\B4\FCMw\C2I\8E\9B\E3\A9~9u\FA\D3l\80\C8%p\EE\FDn2� \00$\FEj\C4e\A9\DB\~\95\A7\A5\80EK\BB\8DDsP\00@@AD'k\CF\E8\DB\D2(\80\9AK\D3\85\D6lb\F2\BA\8C*\80\00)\95 59\A3R:\F3\CE"\B6\80\88\00\00i1u4�\E9\F2�\A6\A2\FACM\93WMb*\E0*\00\00\00\00\00(\A8\80\00\00\80\00\00\00\00\00\00\00\00\00\FF\D9 C/// #----------------------------------------------------------------------------- # Copyright (c) 2008-2010, David P. D. Moss. All rights reserved. # # Released under the BSD license. See the LICENSE file for details. #----------------------------------------------------------------------------- """Common code shared between various netaddr sub modules""" import sys as _sys import struct as _struct import pprint as _pprint from netaddr.compat import _callable, _iter_dict_keys #: True if platform is natively big endian, False otherwise. BIG_ENDIAN_PLATFORM = _sys.byteorder == 'big' #: Use inet_pton() semantics instead of inet_aton() when parsing IPv4. P = INET_PTON = 1 #: Remove any preceding zeros from IPv4 address octets before parsing. Z = ZEROFILL = 2 #: Remove any host bits found to the right of an applied CIDR prefix. N = NOHOST = 4 #----------------------------------------------------------------------------- # Custom exceptions. #----------------------------------------------------------------------------- class AddrFormatError(Exception): """ An Exception indicating a network address is not correctly formatted. """ pass #----------------------------------------------------------------------------- class AddrConversionError(Exception): """ An Exception indicating a failure to convert between address types or notations. """ pass #----------------------------------------------------------------------------- class NotRegisteredError(Exception): """ An Exception indicating that an OUI or IAB was not found in the IEEE Registry. """ pass #----------------------------------------------------------------------------- def num_bits(int_val): """ @param int_val: an unsigned integer. @return: the minimum number of bits needed to represent value provided. """ int_val = abs(int_val) numbits = 0 while int_val: numbits += 1 int_val >>= 1 return numbits #----------------------------------------------------------------------------- class Subscriber(object): """ An abstract class defining the interface expected by a Publisher. """ def update(self, data): """ A callback method used by a Publisher to notify this Subscriber about updates. @param data: a Python object containing data provided by Publisher. """ raise NotImplementedError('cannot invoke virtual method!') #----------------------------------------------------------------------------- class PrettyPrinter(Subscriber): """ A concrete Subscriber that employs the pprint in the standard library to format all data from updates received, writing them to a file-like object. Useful as a debugging aid. """ def __init__(self, fh=_sys.stdout, write_eol=True): """ Constructor. @param fh: a file-like object to write updates to. Default: sys.stdout. @param write_eol: if C{True} this object will write newlines to output, if C{False} it will not. """ self.fh = fh self.write_eol = write_eol def update(self, data): """ A callback method used by a Publisher to notify this Subscriber about updates. @param data: a Python object containing data provided by Publisher. """ self.fh.write(_pprint.pformat(data)) if self.write_eol: self.fh.write("\n") #----------------------------------------------------------------------------- class Publisher(object): """ A 'push' Publisher that maintains a list of Subscriber objects notifying them of state changes by passing them update data when it encounter events of interest. """ def __init__(self): """Constructor""" self.subscribers = [] def attach(self, subscriber): """ Add a new subscriber. @param subscriber: a new object that implements the Subscriber object interface. """ if hasattr(subscriber, 'update') and \ _callable(eval('subscriber.update')): if subscriber not in self.subscribers: self.subscribers.append(subscriber) else: raise TypeError('%r does not support required interface!' \ % subscriber) def detach(self, subscriber): """ Remove an existing subscriber. @param subscriber: a new object that implements the Subscriber object interface. """ try: self.subscribers.remove(subscriber) except ValueError: pass def notify(self, data): """ Send update data to to all registered Subscribers. @param data: the data to be