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

    public function readChunk($x, $z)
    {
        $index = self::getChunkOffset($x, $z);
        if ($index < 0 or $index >= 4096) {
            return null;
        }
        $this->lastUsed = time();
        if (!$this->isChunkGenerated($index)) {
            return null;
        }
        fseek($this->filePointer, $this->locationTable[$index][0] << 12);
        $length = Binary::readInt(fread($this->filePointer, 4));
        $compression = ord(fgetc($this->filePointer));
        if ($length <= 0 or $length > self::MAX_SECTOR_LENGTH) {
            //Not yet generated / corrupted
            if ($length >= self::MAX_SECTOR_LENGTH) {
                $this->locationTable[$index][0] = ++$this->lastSector;
                $this->locationTable[$index][1] = 1;
                MainLogger::getLogger()->error("Corrupted chunk header detected");
            }
            return null;
        }
        if ($length > $this->locationTable[$index][1] << 12) {
            //Invalid chunk, bigger than defined number of sectors
            MainLogger::getLogger()->error("Corrupted bigger chunk detected");
            $this->locationTable[$index][1] = $length >> 12;
            $this->writeLocationIndex($index);
        } elseif ($compression !== self::COMPRESSION_ZLIB and $compression !== self::COMPRESSION_GZIP) {
            MainLogger::getLogger()->error("Invalid compression type");
            return null;
        }
        $chunk = $this->unserializeChunk(fread($this->filePointer, $length - 1));
        if ($chunk instanceof FullChunk) {
            return $chunk;
        } else {
            MainLogger::getLogger()->error("Corrupted chunk detected");
            return null;
        }
    }