#!/usr/bin/env perl
# Visual hex dump using CP437-like graphics.
# Only few fonts can handle that, but it's better than |........|.
# klg, Jul 2015; Jan 2018
use strict;
use utf8;
use open ':std', (
  IN => ':bytes',
  OUT => ':locale'
);

use constant CP437 => q<
 ☺☻♥♦♣♠•◘○◙♂♀♪♫☼►◄↕‼¶§▬↨↑↓→←∟↔▲▼
 !"#$%&'()*+,-./0123456789:;<=>?
@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
`abcdefghijklmnopqrstuvwxyz{|}~⌂
ÇüéâäàåçêëèïîìÄÅÉæÆôöòûùÿÖÜ¢£¥₧ƒ
áíóúñѪº¿⌐¬½¼¡«»░▒▓│┤╡╢╖╕╣║╗╝╜╛┐
└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀
αßΓπΣσµτΦΘΩδ∞φε∩≡±≥≤⌠⌡÷≈°∙·√ⁿ²■
> =~ s:[\r\n]::gr;
die unless 256 == length CP437;

my @G = split '', CP437;

my $addr = 0;
my $cnul = 0;
my $prev = '';

local $/ = \16;

while (<<>>) {
  if ($_ eq $prev) {
    print "*\n" unless $cnul++;
  } else {
    $cnul = 0;
    my $H = join('  ',
      map { join' ', map {sprintf'%02x',ord} split'' } unpack '(a8)2');
    my $C = join '', map $G[$_], unpack 'C*';
    printf "%08x  %-48s  │%s│\n", $addr, $H, $C;
  }
  $prev = $_;
  $addr += length;
}
printf "%08x\n", $addr;

1;