scripts: add srecimage.pl, a script to convert binaries to SREC format

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45808 3c298f89-4303-0410-b956-a3cf2f4a3e73

scripts/srecimage.pl

@@ -0,0 +1,57 @@
+#!/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;