source: vendor/gcc/3.2.2/libjava/scripts/encodings.pl

# encodings.pl - Download IANA text and compute alias list.
# Assumes you are running this program from gnu/gcj/convert/.
# Output suitable for direct inclusion in IOConverter.java.

# Map IANA canonical names onto our canonical names.
%map = (
        'ANSI_X3.4-1968' => 'ASCII',
        'ISO_8859-1:1987' => '8859_1',
        'UTF-8' => 'UTF8',
        'Shift_JIS' => 'SJIS',
        'Extended_UNIX_Code_Packed_Format_for_Japanese' => 'EUCJIS'
        );

if ($ARGV[0] eq '')
{
    $file = 'character-sets';
    if (! -f $file)
    {
        # Too painful to figure out how to get Perl to do it.
        system 'wget -o .wget-log http://www.iana.org/assignments/character-sets';
    }
}
else
{
    $file = $ARGV[0];
}

open (INPUT, "< $file") || die "couldn't open $file: $!";

$body = 0;
$current = '';
while (<INPUT>)
{
    chop;
    $body = 1 if /^Name:/;
    next unless $body;

    if (/^$/)
    {
        $current = '';
        next;
    }

    ($type, $name) = split (/\s+/);
    # Encoding names are case-insensitive.  We do all processing on
    # the lower-case form.
    my $lower = lc ($name);
    if ($type eq 'Name:')
    {
        $current = $map{$name};
        if ($current)
        {
            print "    hash.put (\"$lower\", \"$current\");\n";
        }
    }
    elsif ($type eq 'Alias:')
    {
        # The IANA list has some ugliness.
        if ($name ne '' && $name ne 'NONE' && $current)
        {
            print "    hash.put (\"$lower\", \"$current\");\n";
        }
    }
}

close (INPUT);