#!/usr/bin/perl
# mz5 - program to encode files into mz5 encoding.
# See http://gnusto.mozdev.org/nullbytes.html for why you'd want to.
#
# Many thanks to Cedric Knight for suggestions and modifications, especially
# ones for using the script on Windows.
#
# $Header: /cvs/gnusto/downloads/mz5,v 1.3 2003/03/09 23:51:40 marnanel Exp $
#
# Copyright (c) 2003 Thomas Thurman - thomas@thurman.org.uk
#
# 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 be able to view the GNU General Public License at
# http://www.gnu.org/copyleft/gpl.html ; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.


use strict;
undef $/; # slurp entire file

$_=$ARGV[0];
my $i=$_;
s/\.z5/\.mz5/i;
my $o=$_;
if ($i eq $o)
    {print "Expected one parameter, a z5 file.\n"; die;}

open (INZ5, "<$i");
open (OUTMZ5, ">$o");

binmode (INZ5);  # for DOS/Windows
binmode (OUTMZ5);

my $file_with_nulls = <INZ5>;
my $replaced = '';
my $fixups = '';

for (my $i=0; $i<length($file_with_nulls); $i++) {
    my $candidate = substr($file_with_nulls, $i, 1);

    if ($candidate eq "\000") {
 $replaced = $replaced . "0";
 $fixups = $fixups . 'Y';
    } else {
 $replaced = $replaced . $candidate;
 $fixups = $fixups . 'n';
    }
}

print OUTMZ5 $replaced.$fixups;  # print entire file

# eof mz5