/**
* parse pdu string
* @param PDU $pdu
* @return \self
* @throws Exception
*/
public static function parse(Submit $pdu)
{
$vp = new self($pdu);
switch ($pdu->getType()->getVpf()) {
case Type::VPF_NONE:
return $vp;
case Type::VPF_ABSOLUTE:
return SCTS::parse();
case Type::VPF_RELATIVE:
$byte = hexdec(PDU::getPduSubstr(2));
if ($byte <= 143) {
$vp->_interval = ($byte + 1) * (5 * 60);
} else {
if ($byte <= 167) {
$vp->_interval = 3600 * 24 * 12 + ($byte - 143) * (30 * 60);
} else {
if ($byte <= 196) {
$vp->_interval = ($byte - 166) * (3600 * 24);
} else {
$vp->_interval = ($byte - 192) * (3600 * 24 * 7);
}
}
}
return $vp;
default:
throw new Exception("Unknown VPF");
}
}
