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/usr/share/gfxboot/bin/keytab is in gfxboot-dev 4.5.2-1.1-5.

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#! /usr/bin/perl

use Encode;
use Getopt::Long;

sub get_table;
sub do_enc;

$opt_all = 0;
$opt_enc = undef;
$opt_uni = 0;

GetOptions(
  'all' => \$opt_all,
  'enc=s' => \$opt_enc,
  'uni' => \$opt_uni,
);

$keytable = shift;

@us_map{get_table "us"} = () unless $opt_all;
@map = get_table $keytable;

for (keys %us_map) {
  delete $us_map{$_} if /\[\s*0x56/;
}


print "/keymap.$keytable [\n";
for (@map) {
  print $_ unless exists $us_map{$_};
}
print "] def\n";


sub get_table
{
  local $_;
  my ($kt, $map_idx, @map, @psmap, $x, $n, $s, $a);

  $kt = shift;

  open F, "loadkeys" . ($opt_uni ? " -u" : "") . " -m $kt |";
  while(<F>) {
    $map_idx = 0 if /u_short/;
    if(/u_short\s+plain_map\[/) { $map_idx = 1; $key_idx = 0 }
    if(/u_short\s+shift_map\[/) { $map_idx = 2; $key_idx = 0 }
    if(/u_short\s+altgr_map\[/) { $map_idx = 3; $key_idx = 0 }
    if($map_idx) {
      if($opt_uni) {
        while(/(0x[0-9a-f]{4}),/g) {
          $x = $1;
          $map[$key_idx][0] = $key_idx;
          $map[$key_idx][$map_idx] = hex($x) if $x !~ /0xf/;
          $map[$key_idx][$map_idx] = hex($x) & 0xff if $x =~ /0xf[0b]/;
          $key_idx++;
        }
      }
      else {
        while(/(0xf\S{3}),/g) {
          $x = $1;
          $map[$key_idx][0] = $key_idx;
          $map[$key_idx][$map_idx] = hex($x) & 0xff if $x =~ /0xf[0b]/;
          $key_idx++;
        }
      }
    }
  }
  close F;

  for (@map) {
    ($n, $s, $a) = ($_->[1], $_->[2], $_->[3]);
    $a = 0 if $a == $n || $a == $s;
    if($n || $s || $a) {
      push @psmap, sprintf("  [ 0x%02x 0x%02x 0x%02x 0x%02x ]\n", $_->[0], do_enc($n), do_enc($s), do_enc($a));
    }
  }

  @psmap;
}


sub do_enc
{
  my ($c);

  $c = shift;

  return $c unless $opt_enc;

  return unpack("V", encode("utf32le", decode($opt_enc, chr($c))));
}