ns-packet.tcl

在Linux下做的QuadTree的程序

#
# Copyright (c) 1997 Regents of the University of California.
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
# 	This product includes software developed by the MASH Research
# 	Group at the University of California Berkeley.
# 4. Neither the name of the University nor of the Research Group may be
#    used to endorse or promote products derived from this software without
#    specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# @(#) $Header: /home/am6/jinyang/cvs/our-ns/tcl/lib/ns-packet.tcl,v 1.3 2000/11/17 23:45:05 decouto Exp $
#
#
# set up the packet format for the simulation
# (initial version)
#

PacketHeaderManager set hdrlen_ 0

#XXX could potentially get rid of this by searching having a more
# uniform offset concept...

#
# Added by Josh.
#
foreach cl [PacketHeader info subclass] {
	PacketHeaderManager set vartab_($cl) ""
}

foreach pair {
		{ Common off_cmn_ }
		{ Mac off_mac_ }
		{ LL off_ll_ }
		{ ARP off_arp_ }
#		{ Snoop off_snoop_ }
		{ SR off_SR_ }
		{ IP off_ip_ }
		{ TCP off_tcp_ }
#		{ TCPA off_tcpasym_ }
		{ Flags off_flags_ }
		{ TORA off_TORA_ }
                { AODV off_AODV_ }
		{ IMEP off_IMEP_ }
		{ RTP off_rtp_ }
		{ HGPS off_HGPS_ }
		{ Grid_LR off_grid_lr_ }		
		{ Grid_Encap off_grid_encap_ }
#		{ Message off_msg_ }
#		{ IVS off_ivs_ }
#		{ rtProtoDV off_DV_ }
#		{ CtrMcast off_CtrMcast_ }
#		{ Prune off_prune_ }
#		{ Tap off_tap_ } 
#		{ aSRM off_asrm_ }
#		{ SRM off_srm_ }
#		{ SRMEXT off_srm_ext_}} {
	} {
	set cl PacketHeader/[lindex $pair 0]
	set var [lindex $pair 1]
	PacketHeaderManager set vartab_($cl) $var
}

proc PktHdr_offset {hdrName {field ""}} {
	set var [PacketHeaderManager set vartab_($hdrName)]
	set offset [TclObject set $var]
	if {$field != ""} {
		incr offset [$hdrName set offset_($field)]
	}
	return $offset
}

#
# Changed by Josh to eliminate some packet header formats.
#
Simulator instproc create_packetformat { } {
	set pm [new PacketHeaderManager]
	foreach cl [PacketHeader info subclass] {
		if { [PacketHeaderManager set vartab_($cl)] != "" } {
			set var [PacketHeaderManager set vartab_($cl)]
			set off [$pm allochdr [lindex [split $cl /] 1]]
			TclObject set $var $off
			$cl offset $off
		}
	}
	$self set packetManager_ $pm
}

PacketHeaderManager instproc allochdr cl {
	set size [PacketHeader/$cl set hdrlen_]

	$self instvar hdrlen_
	set NS_ALIGN 8
	# round up to nearest NS_ALIGN bytes
	set incr [expr ($size + ($NS_ALIGN-1)) & ~($NS_ALIGN-1)]
	set base $hdrlen_
	incr hdrlen_ $incr

	return $base
}