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/usr/bin/idl2wrs is in wireshark-dev 2.4.5-1.

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The actual contents of the file can be viewed below.

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#!/bin/sh
#
#  File : idl2wrs
#
#  Author : Frank Singleton (frank.singleton@ericsson.com)
#
#  Copyright (C) 2001 Frank Singleton, Ericsson Inc.
#
#  This file is a simple shell script wrapper for the IDL to 
#  Wireshark dissector code.
#
#  ie: wireshark_be.py and wireshark_gen.py
#
#  This file is used to generate "Wireshark" dissectors from IDL descriptions. 
#  The output language generated is "C". It will generate code to use the 
#  GIOP/IIOP get_CDR_XXX API.
#
#  Please see packet-giop.h in Wireshark distro for API description.
#  Wireshark is available at http://www.wireshark.org/
#
#  Omniidl is part of the OmniOrb distribution, and is available at
#  http://omniorb.sourceforge.net/
#
#  This program is free software; you can redistribute it and/or modify it
#  under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#  General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
#  02111-1307, USA.
#


#  Must at least supply an IDL file

if [ $# -lt 1 ]; then
    echo "idl2wrs Error: no IDL file specified."
    echo "Usage: idl2wrs idl_file_name"
    exit 1;
fi

# Check the file name for valid characters.
# Implementation based on Dave Taylor's validalnum shell script from his book,
# "Wicked Cool Shell Scripts", as well as Mark Rushakoff's answer he provided
# to the question posted at stackoverflow.com entitled, "How can I use the
# UNIX shell to count the number of times a letter appears in a text file?"
file=$(basename $1)
compressed="$(echo $file | sed 's/[^[:alnum:]._]//g')"
if [ "$compressed" != "$file" ]; then
    echo "idl2wrs Error: Invalid file name: $file"
    exit 1;
fi

# Only allow one '.' at most.
count=$(echo $compressed | awk -F. '{c += NF - 1} END {print c}')
if [ $count -gt 1 ] ; then
    echo "idl2wrs Error: Invalid file name: $file"
    exit 1;
fi

exec omniidl -b wireshark_be $@


#
# Editor modelines  -  http://www.wireshark.org/tools/modelines.html
#
# Local variables:
# c-basic-offset: 4
# indent-tabs-mode: nil
# End:
#
# vi: set shiftwidth=4 expandtab:
# :indentSize=4:noTabs=true:
#