/**
* Create a child if it doesn't exist; don't do anything if it does.
*
* @param \Nbt\Node $parent
* @param string $childName
* @param int $childType
* @param mixed $childValue
*/
protected function createChildOnly(\Nbt\Node $parent, $childName, $childType, $childValue)
{
if (!$parent->findChildByName($childName)) {
$child = (new \Nbt\Node())->setType($childType)->setName($childName)->setValue($childValue);
$parent->addChild($child);
}
}
/**
* Add the 'tag' compount tag, if it doesn't already exist.
*/
protected function addTag()
{
if (!isset($this->tag)) {
$this->tag = \Nbt\Tag::tagCompound('tag', []);
$this->node->addChild($this->tag);
}
}
/**
* Convert a signed value to an unsigned value.
* The NBT spec calls for signed values, but some bytes should be unsigned,
* so we need to fiddle them.
*
* @param \Nbt\Node $node
*/
private function signedToUnsignedByteValue(\Nbt\Node $node)
{
$value = $node->getValue();
if (is_array($value)) {
array_walk($value, function (&$byte) {
$byte = $this->signedToUnsigedByte($byte);
});
$node->setValue($value);
} else {
$node->setValue($this->signedToUnsigedByte($value));
}
}