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<?php
namespace callnotifier;
class EDSS1_Parser
{
const PARAM = 0;
const PARAMLENGTH = 1;
const PARAMVAL = 2;
public function parse($bytes)
{
$m = new EDSS1_Message();
$m->sapi = ord($bytes{0}) >> 2;
$m->callResponse = (int) ((ord($bytes{0}) & 2) == 2);
$m->tei = ord($bytes{1}) >> 1;
$curpos = 4;
list($curpos, $cCallRef, $crLen) = $this->readLengthData($bytes, ++$curpos);
if ($crLen == 0xFF) {
return $m;
}
if ($crLen > 0) {
$m->callRefType = ord($cCallRef{0}) >> 7;
$nCallRef = ord($cCallRef{0}) & 127;
if ($crLen > 1) {
$nCallRef = ord($cCallRef{1}) + ($nCallRef << 8);
if ($crLen > 2) {
$nCallRef = ord($cCallRef{2}) + ($nCallRef << 8);
}
}
$m->callRef = $nCallRef;
}
$m->type = ord($bytes{++$curpos});
$complete = false;
do {
//parameter type
$curbit = $bytes{++$curpos};
if ($curbit == "\xFF" && $bytes{$curpos + 1} == "\n") {
$complete = true;
break;
}
$paramType = ord($curbit);
$param = $this->getParameterByType($paramType);
$m->parameters[] = $param;
//parameter length
$curbit = $bytes{++$curpos};
$param->length = ord($curbit);
//parameter data
$param->setData(substr($bytes, $curpos + 1, $param->length));
$curpos += $param->length;
} while ($curpos < strlen($bytes) - 1);
return $m;
}
/**
* Read a datablock preceded with a length byte.
*
* @return array Array with new cursor position, data and data length
*/
public function readLengthData($bytes, $curpos)
{
//var_dump('old' . $curpos);
$length = ord($bytes{$curpos});
if ($length != 0xFF) {
$data = substr($bytes, $curpos + 1, $length);
} else {
$data = null;
}
return array($curpos + $length, $data, $length);
}
/**
* @param integer $type Parameter type ID
*/
public function getParameterByType($type)
{
$supported = array(0x28, 0x2C, 0x4C, 0x6C, 0x70);
if (!in_array($type, $supported)) {
return new EDSS1_Parameter($type);
}
$typeHex = sprintf('%02X', $type);
$class = 'callnotifier\EDSS1_Parameter_' . $typeHex;
return new $class($type);
}
}
?>
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