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#!/usr/bin/env perl | |
use strict; | |
use warnings; | |
use Getopt::Long; | |
sub gen_pattern { | |
my ($size) = @_; | |
my @sym1 = "A" .. "Z"; | |
my @sym2 = "a" .. "Z"; | |
my @sym3 = "0" .. "9"; | |
my $pattern = ""; | |
GEN: | |
while (length($pattern) < $size) { | |
for my $a (@sym1) { | |
for my $b (@sym2) { | |
for my $c (@sym3) { | |
$pattern .= $a if length($pattern) < $size; | |
$pattern .= $b if length($pattern) < $size; | |
$pattern .= $c if length($pattern) < $size; | |
last GEN if length($pattern) == $size; | |
} | |
} | |
} | |
} | |
$pattern; | |
} | |
my ($size, $find); | |
my $input = "-"; | |
my $output = "-"; | |
GetOptions( | |
"s|size=i" => \$size, | |
"f|find=s" => \$find, | |
"i|input=s" => \$input, | |
"o|output=s" => \$output, | |
); | |
open(my $out, ">$output"); | |
open(my $in, "<$input"); | |
if (defined($size) && $size > 0) { | |
print $out gen_pattern($size), "\n"; | |
} | |
if (defined($find) && length($find) > 0) { | |
my $pattern = join '', map { chomp; $_ } <$in>; | |
my $chunk = join '', reverse map { chr hex } $find =~ /.{2}/g; | |
my $offset = index($pattern, $chunk); | |
die "Offset not found" if $offset < 0; | |
print "Offset: $offset\n"; | |
} |
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