#
# Copyright (c) 2011, EPFL (Ecole Politechnique Federale de Lausanne)
# All rights reserved.
#
# Created by Marco Canini, Daniele Venzano, Dejan Kostic, Jennifer Rexford
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#   -  Redistributions of source code must retain the above copyright notice,
#      this list of conditions and the following disclaimer.
#   -  Redistributions in binary form must reproduce the above copyright notice,
#      this list of conditions and the following disclaimer in the documentation
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#   -  Neither the names of the contributors, nor their associated universities or
#      organizations may be used to endorse or promote products derived from this
#      software without specific prior written permission.
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from integers import SymbolicInteger

symbolic_vars = {}
symbolic_packets = {}

def newInteger(name, bitlen=32):
	if name not in symbolic_vars.keys():
		symbolic_vars[name] = SymbolicInteger(name, bitlen)
	return symbolic_vars[name]

def newEthernetPacket(name):
	from nox.lib.packet.ethernet import ethernet
	if name not in symbolic_packets.keys():
		symbolic_packets[name] = ethernet(name)
	return symbolic_packets[name]

