#!/usr/bin/perl

use strict;
use integer;

my($infile,$outfile,$length) = @ARGV;

unless (defined($outfile)) {
    die "Usage: $0 infile outfile [length]\n";
}

sub nextblock($$$) {
    my($block,$len,$limit) = @_;

    my $bytes = $block;

    if (defined($limit) && $limit - $len < $bytes) {
	$bytes = $limit - $len;
    }
    return $bytes;
}

open(my $in, '<', $infile) or die "$0: $infile: $!\n";
binmode $in;
my $data;
my $sum = 0;
my $len = 0;
my $blocklen;
while (($blocklen = nextblock(4096, $len, $length)) &&
       read($in, $data, $blocklen) == $blocklen) {
    foreach my $w (unpack("V*", $data)) {
	$sum = ($sum + $w) & 0xffffffff;
    }
    $len += $blocklen;
}
close($in);

open(my $out, '>', $outfile) or die "$0: $outfile: $!\n";

my $outfile_c = uc($outfile);
$outfile_c =~ s/[\W_]+/_/g;

print  $out "#ifndef $outfile_c\n";
print  $out "#define $outfile_c\n";
printf $out "#define SDRAM_SUM 0x%08x\n", $sum;
print  $out "#endif\n";

close($out);