pocketmine\level\format\mcregion\RegionLoader::loadLocationTable PHP Метод

    protected function loadLocationTable()
    {
        fseek($this->filePointer, 0);
        $this->lastSector = 1;
        $data = unpack("N*", fread($this->filePointer, 4 * 1024 * 2));
        //1024 records * 4 bytes * 2 times
        for ($i = 0; $i < 1024; ++$i) {
            $index = $data[$i + 1];
            $this->locationTable[$i] = [$index >> 8, $index & 0xff, $data[1024 + $i + 1]];
            if ($this->locationTable[$i][0] + $this->locationTable[$i][1] - 1 > $this->lastSector) {
                $this->lastSector = $this->locationTable[$i][0] + $this->locationTable[$i][1] - 1;
            }
        }
    }