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#!/usr/bin/perl -w
# 2007 Frank Haverkamp <>
# Program for bit-error injection. I am sure that perl experts do it
# in 1 line. Please let me know how it is done right ;-).
use strict;
use warnings;
use Getopt::Long;
use Pod::Usage;
my $i;
my $help;
my $result;
my $offset = 0;
my $bitmask = 0x01;
my $in = "input.mif";
my $out = "output.mif";
$result = GetOptions ("offset=i" => \$offset, # numeric
"bitmask=o" => \$bitmask, # numeric
"input=s" => \$in, # string
"output=s" => \$out, # string
"help|?" => \$help) or pod2usage(2);
pod2usage(1) if $help;
my $buf;
open(my $in_fh, "<", $in)
or die "Cannot open file $in: $!";
binmode $in_fh;
open(my $out_fh, ">", $out) or
die "Cannot open file $out: $!";
binmode $out_fh;
$i = 0;
while (sysread($in_fh, $buf, 1)) {
$buf = pack('C', unpack('C', $buf) ^ $bitmask) if ($i == $offset);
syswrite($out_fh, $buf, 1) or
die "Cannot write to offset $offset: $!";
close $in_fh;
close $out_fh;
=head1 NAME
=head1 SYNOPSIS [options]
=head1 OPTIONS
=over 8
=item B<--help>
Print a brief help message and exits.
=item B<--offset>=I<offset>
Byte-offset where bit-error should be injected.
=item B<--bitmask>=I<bitmask>
Bit-mask where to inject errors in the byte.
=item B<--input>=I<input-file>
Input file.
=item B<--output>=I<output-file>
Output file.
B<> will read the given input file and inject
biterrors at the I<offset> specified. The location of the biterrors
are defined by the I<bitmask> parameter.