66 lines
2.0 KiB
Perl
66 lines
2.0 KiB
Perl
#! /usr/bin/perl -w
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# librsync -- the library for network deltas
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# Id: mutate.pl,v 1.3 2001/03/18 10:54:34 mbp Exp
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#
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# Copyright (C) 1999, 2000 by Martin Pool <mbp@samba.org>
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# Copyright (C) 1999 by Andrew Tridgell <tridge@samba.org>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public License
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# as published by the Free Software Foundation; either version 2.1 of
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# the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this program; if not, write to the Free Software
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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# mutate: makes a random smalll change to an input file and writes it
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# to stdout.
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use strict;
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if ($#ARGV != 1) {
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print STDERR "usage: mutate.pl SEED MUTATIONS <BASIS\n";
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exit 1;
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}
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srand shift @ARGV;
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my $n_muts = 1 + int rand shift @ARGV;
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undef $/; # slurp whole file
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my $corpus = <STDIN>;
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printf STDERR "%d mutations\n", $n_muts;
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while ($n_muts-- > 0) {
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my $in_len = length($corpus);
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my $from_off = int rand $in_len;
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my $from_len = int(rand(1.0) * rand($in_len));
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my $to_off = int rand $in_len;
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my $to_len = int(rand(1.0) * rand($in_len));
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my $op = rand 3;
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if ($op < 1.0) {
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printf STDERR "copy and overwrite";
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substr($corpus, $to_off, $to_len) = substr($corpus, $from_off, $from_len);
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} elsif ($op < 2.0) {
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print STDERR "copy and insert";
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substr($corpus, $to_off, 0) = substr($corpus, $from_off, $from_len);
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} else {
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print STDERR "delete";
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substr($corpus, $to_off, $to_len) = '';
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}
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printf STDERR " (%d, %d) -> (%d, %d)\n", $from_off, $from_len, $to_off, $to_len;
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}
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print $corpus;
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