while (<$filename>) {
print encode_base64($_);
}


sub encode_base64 ($) {
my $res = "";
my $eol = "\n";
pos($_[0]) = 0;
while ($_[0] =~ /(.{1,45})/gs) {
$res .= substr(pack("u", $1), 1);
chop($res);
}
$res =~ tr|` -_|AA-Za-z0-9+/|;
my $padding = (3 - length($_[0]) % 3) % 3;
$res =~ s/.{$padding}$/"=" x $padding/e if $padding;
if (length $eol) {
$res =~ s/(.{1,76})/$1$eol/g;
}
$res;
}