#! /usr/bin/env perl

# Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.

#

# Licensed under the OpenSSL license (the "License").  You may not use

# this file except in compliance with the License.  You can obtain a copy

# in the file LICENSE in the source distribution or at

# https://www.openssl.org/source/license.html

($#ARGV == 1) || die "usage: cmp.pl <file1> <file2>\n";

open(IN0,"<$ARGV[0]") || die "unable to open $ARGV[0]\n";

open(IN1,"<$ARGV[1]") || die "unable to open $ARGV[1]\n";

binmode IN0;

binmode IN1;

$tot=0;

$ret=1;

for (;;)

{

    $n1=sysread(IN0,$b1,4096);

    $n2=sysread(IN1,$b2,4096);

    last if ($n1 != $n2);

    last if ($b1 ne $b2);

    last if ($n1 < 0);

    if ($n1 == 0)

    {

        $ret=0;

        last;

    }

    $tot+=$n1;

}

close(IN0);

close(IN1);

if ($ret)

{

    printf STDERR "$ARGV[0] and $ARGV[1] are different\n";

    @a1=unpack("C*",$b1);

    @a2=unpack("C*",$b2);

    for ($i=0; $i<=$#a1; $i++)

    {

        if ($a1[$i] ne $a2[$i])

        {

            printf "%02X %02X <<\n",$a1[$i],$a2[$i];

            last;

        }

    }

    $nm=$tot+$n1;

    $tot+=$i+1;

    printf STDERR "diff at char $tot of $nm\n";

}

exit($ret);