private function computePartSize($partSize)
{
$partSize = (int) $partSize;
if ($partSize <= self::OSS_MIN_PART_SIZE) {
$partSize = self::OSS_MIN_PART_SIZE;
} elseif ($partSize > self::OSS_MAX_PART_SIZE) {
$partSize = self::OSS_MAX_PART_SIZE;
}
return $partSize;
}