/**
* Parse Interface Statistics Block.
* @param string $raw Binary string
* @param int $currentPosition Current position in file
* @return array
* @throws Exception
*/
public function parse($raw, &$currentPosition)
{
$blockStart = PcapngParser::bin2hexEndian(substr($raw, $currentPosition, 4));
if ($blockStart !== static::BYTE_TYPE) {
throw new Exception('Unknown format of Interface Statistics Block');
}
// Block Total Length
$totalLength = PcapngParser::rawToDecimal(substr($raw, $currentPosition + 4, 4));
$block['length'] = $totalLength;
$interfaceId = PcapngParser::rawToDecimal(substr($raw, $currentPosition + 8, 4));
$block['interface_id'] = $interfaceId;
$timestampHigh = PcapngParser::rawToFloat(substr($raw, $currentPosition + 12, 4));
//todo wrong representation
$block['timestamp_high'] = $timestampHigh;
$timestampLow = PcapngParser::rawToFloat(substr($raw, $currentPosition + 16, 4));
//todo wrong representation
$block['timestamp_low'] = $timestampLow;
$currentPosition += 20;
$this->parseOptions($raw, $currentPosition);
$lengthEnd = PcapngParser::rawToDecimal(substr($raw, $currentPosition, 4));
if ($lengthEnd !== $totalLength) {
throw new Exception('Unknown format');
}
$currentPosition += 4;
}
