Convert PHP to javascript

[Mantas <grawity@xxxxxxxxx>]

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Hi there,

Could someone help me to convert this snippet of PHP code to JavaScript?

<?php
$b91_enctab = array(
    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
    'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
    'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '!', '#', '$',
    '%', '&', '(', ')', '*', '+', ',', '.', '/', ':', ';', '<', '=',
    '>', '?', '@', '[', ']', '^', '_', '`', '{', '|', '}', '~', '"'
);
$b91_dectab = array_flip($b91_enctab);

function base91_decode($d)
{
    global $b91_dectab;
    $l = strlen($d);
    $v = -1;
    for ($i = 0; $i < $l; ++$i) {
        $c = $b91_dectab[$d{$i}];
        if (!isset($c))
            continue;
        if ($v < 0)
            $v = $c;
        else {
            $v += $c * 91;
            $b |= $v << $n;
            $n += ($v & 8191) > 88 ? 13 : 14;
            do {
                $o .= chr($b & 255);
                $b >>= 8;
                $n -= 8;
            } while ($n > 7);
            $v = -1;
        }
    }
    if ($v + 1)
        $o .= chr(($b | $v << $n) & 255);
    return $o;
}

function base91_encode($d)
{
    global $b91_enctab;
    $l = strlen($d);
    for ($i = 0; $i < $l; ++$i) {
        $b |= ord($d{$i}) << $n;
        $n += 8;
        if ($n > 13) {
            $v = $b & 8191;
            if ($v > 88) {
                $b >>= 13;
                $n -= 13;
            } else {
                $v = $b & 16383;
                $b >>= 14;
                $n -= 14;
            }
            $o .= $b91_enctab[$v % 91] . $b91_enctab[$v / 91];
        }
    }
    if ($n) {
        $o .= $b91_enctab[$b % 91];
        if ($n > 7 || $b > 90)
            $o .= $b91_enctab[$b / 91];
    }
    return $o;
}
?>

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