function voucher_used_count($roll)
{
global $g, $cpzone;
$bitstring = voucher_read_used_db($roll);
$max = strlen($bitstring) * 8;
$used = 0;
for ($i = 1; $i <= $max; $i++) {
// check if ticket already used or not.
$pos = $i >> 3;
// divide by 8 -> octet
$mask = 1 << $i % 8;
// mask to test bit in octet
if (ord($bitstring[$pos]) & $mask) {
$used++;
}
}
unset($bitstring);
return $used;
}
$voucherlck = lock("voucher{$cpzone}");
if ($_POST['count'] != $rollent['count']) {
$rollent['count'] = $_POST['count'];
$len = ($rollent['count'] >> 3) + 1;
// count / 8 +1
$rollent['used'] = base64_encode(str_repeat("", $len));
// 4 bitmask
$rollent['active'] = array();
voucher_write_used_db($rollent['number'], $rollent['used']);
voucher_write_active_db($rollent['number'], array());
// create empty DB
voucher_log(LOG_INFO, sprintf(gettext('All %1$s vouchers from Roll %2$s marked unused'), $rollent['count'], $rollent['number']));
} else {
// existing roll has been modified but without changing the count
// read active and used DB from ramdisk and store it in XML config
$rollent['used'] = base64_encode(voucher_read_used_db($rollent['number']));
$activent = array();
$db = array();
$active_vouchers = voucher_read_active_db($rollent['number'], $rollent['minutes']);
foreach ($active_vouchers as $voucher => $line) {
list($timestamp, $minutes) = explode(",", $line);
$activent['voucher'] = $voucher;
$activent['timestamp'] = $timestamp;
$activent['minutes'] = $minutes;
$db[] = $activent;
}
$rollent['active'] = $db;
}
unlock($voucherlck);
if (isset($id) && $a_roll[$id]) {
$a_roll[$id] = $rollent;
