static function decodeId($id)
{
if (!$id) {
return array(false, '', '');
}
$result = '';
$len = strlen($id);
$i = 0;
$replacements = array('z' => 'z', 'a' => '+', 'b' => '/', 'c' => '=');
while ($i < $len - 1) {
$r = $id[$i];
$c1 = $id[$i];
++$i;
if ($c1 == 'z') {
$c2 = $id[$i];
if (isset($replacements[$c2])) {
$r = $replacements[$c2];
++$i;
}
}
$result .= $r;
}
if ($i < $len) {
$result .= $id[$i];
}
$result = bin2hex(base64_decode($result));
$a = substr($result, 0, 32);
$b = substr($result, 32, 32);
$secret = Q_Config::get('Q', 'external', 'secret', null);
$c = isset($secret) ? $b === substr(Q_Utils::hmac('sha1', $a, $secret), 0, 32) : true;
return array($c, $a, $b);
}
