/src/callnotifier/EDSS1/Parser.php
PHP | 94 lines | 69 code | 13 blank | 12 comment | 15 complexity | a28e6b211ffb2c421028aeadc0967b5b MD5 | raw file
Possible License(s): GPL-3.0
- <?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);
- }
- }
- ?>