#! /usr/bin/perl

# Scan a file for a 32-bit word with a particular value.
# $Revision: 1.1 $

use strict qw(refs vars);
use FileHandle;

my $filename = shift @ARGV;
my $word_value = shift @ARGV;

((defined $filename) && (defined $word_value))
    || die "Usage: scan <filename> <word value in hex>\n";

my $fh = new FileHandle("<$filename");
my $val = hex($word_value);

my $buf = ' ' x 4;

my $offset = 0;
while ( read( $fh, $buf, 4) == 4 ) {
    my $out = unpack "V", $buf;
    if ( $out == $val ) {
	print "Found value $word_value at offset $offset\n";
	exit;
    }
    $offset += 4;
}
print "Didn't find value $word_value\n";