1#!/usr/bin/env perl
2#
3# srecimage.pl - script to convert a binary image into srec
4# Copyright (c) 2015 - Jo-Philipp Wich <jow@openwrt.org>
5#
6# This script is in the public domain.
7
8use strict;
9
10my ($input, $output, $offset) = @ARGV;
11
12if (!defined($input) || !-f $input || !defined($output) ||
13    !defined($offset) || $offset !~ /^(0x)?[a-fA-F0-9]+$/) {
14	die "Usage: $0 <input file> <output file> <load address>\n";
15}
16
17sub srec
18{
19	my ($type, $addr, $data, $len) = @_;
20	my @addrtypes = qw(%04X %04X %06X %08X %08X %04X %06X %08X %06X %04X);
21	my $addrstr = sprintf $addrtypes[$type], $addr;
22
23	$len = length($data) if ($len <= 0);
24	$len += 1 + (length($addrstr) / 2);
25
26	my $sum = $len;
27
28	foreach my $byte (unpack('C*', pack('H*', $addrstr)), unpack('C*', $data))
29	{
30		$sum += $byte;
31	}
32
33	return sprintf "S%d%02X%s%s%02X\r\n",
34	       $type, $len, $addrstr, uc(unpack('H*', $data)), ~($sum & 0xFF) & 0xFF;
35}
36
37
38open(IN, '<:raw', $input) || die "Unable to open $input: $!\n";
39open(OUT, '>:raw', $output) || die "Unable to open $output: $!\n";
40
41my ($basename) = $output =~ m!([^/]+)$!;
42
43print OUT srec(0, 0, $basename, 0);
44
45my $off = hex($offset);
46my $len;
47
48while (defined($len = read(IN, my $buf, 16)) && $len > 0)
49{
50	print OUT srec(3, $off, $buf, $len);
51	$off += $len;
52}
53
54print OUT srec(7, hex($offset), "", 0);
55
56close OUT;
57close IN;
58