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#!/usr/bin/env perl
#
# srecimage.pl - script to convert a binary image into srec
# Copyright (c) 2015 - Jo-Philipp Wich <jow@openwrt.org>
#
# This script is in the public domain.
use strict;
my ($input, $output, $offset) = @ARGV;
if (!defined($input) || !-f $input || !defined($output) ||
!defined($offset) || $offset !~ /^(0x)?[a-fA-F0-9]+$/) {
die "Usage: $0 <input file> <output file> <load address>\n";
}
sub srec
{
my ($type, $addr, $data, $len) = @_;
my @addrtypes = qw(%04X %04X %06X %08X %08X %04X %06X %08X %06X %04X);
my $addrstr = sprintf $addrtypes[$type], $addr;
$len = length($data) if ($len <= 0);
$len += 1 + (length($addrstr) / 2);
my $sum = $len;
foreach my $byte (unpack('C*', pack('H*', $addrstr)), unpack('C*', $data))
{
$sum += $byte;
}
return sprintf "S%d%02X%s%s%02X\r\n",
$type, $len, $addrstr, uc(unpack('H*', $data)), ~($sum & 0xFF) & 0xFF;
}
open(IN, '<:raw', $input) || die "Unable to open $input: $!\n";
open(OUT, '>:raw', $output) || die "Unable to open $output: $!\n";
my ($basename) = $output =~ m!([^/]+)$!;
print OUT srec(0, 0, $basename, 0);
my $off = hex($offset);
my $len;
while (defined($len = read(IN, my $buf, 16)) && $len > 0)
{
print OUT srec(3, $off, $buf, $len);
$off += $len;
}
print OUT srec(7, hex($offset), "", 0);
close OUT;
close IN;
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