scripts: add xxdi.pl

xxdi.pl is a Perl script that implements vim's 'xxd -i' mode so that
packages do not have to use all of vim just to get this functionality.

References: #10555
Source: 97a6bd5cee/xxdi.pl
Signed-off-by: Petr Štetiar <ynezz@true.cz>
(cherry picked from commit 2117d04a3a)

scripts/xxdi.pl

@@ -0,0 +1,50 @@
+#!/usr/bin/env perl
+#
+# xxdi.pl - perl implementation of 'xxd -i' mode
+#
+# Copyright 2013 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+# Copyright 2013 Linux Foundation
+#
+# Released under the GPLv2.
+#
+# Implements the "basic" functionality of 'xxd -i' in perl to keep build
+# systems from having to build/install/rely on vim-core, which not all
+# distros want to do.  But everyone has perl, so use it instead.
+#
+
+use strict;
+use warnings;
+use File::Slurp qw(slurp);
+
+my $indata = slurp(@ARGV ? $ARGV[0] : \*STDIN);
+my $len_data = length($indata);
+my $num_digits_per_line = 12;
+my $var_name;
+my $outdata;
+
+# Use the variable name of the file we read from, converting '/' and '.
+# to '_', or, if this is stdin, just use "stdin" as the name.
+if (@ARGV) {
+	$var_name = $ARGV[0];
+	$var_name =~ s/\//_/g;
+	$var_name =~ s/\./_/g;
+} else {
+	$var_name = "stdin";
+}
+
+$outdata .= "unsigned char $var_name\[] = {";
+
+# trailing ',' is acceptable, so instead of duplicating the logic for
+# just the last character, live with the extra ','.
+for (my $key= 0; $key < $len_data; $key++) {
+	if ($key % $num_digits_per_line == 0) {
+		$outdata .= "\n\t";
+	}
+	$outdata .= sprintf("0x%.2x, ", ord(substr($indata, $key, 1)));
+}
+
+$outdata .= "\n};\nunsigned int $var_name\_len = $len_data;\n";
+
+binmode STDOUT;
+print {*STDOUT} $outdata;
+