public function writeTagDataToStream(AbstractTag $tag, $file)
{
$genericType = null;
if ($tag instanceof \Nbt\Tag\ListTag) {
$genericType = TagType::identifyClassName($tag->getGenericType());
}
return $this->writeTagValueToStream(TagType::identify($tag), $tag->getValue(), $file, $genericType);
}
protected function readTagDataFromStream($file, $tagType)
{
if ($tagType == TagType::TAG_BYTE) {
return new \Nbt\Tag\ByteTag($this->unpackNBytes($file, 1, "c"));
}
if ($tagType == TagType::TAG_SHORT) {
$unsigned = $this->unpackNBytes($file, 2, "n");
if ($unsigned >= pow(2, 15)) {
// convert to signed
$unsigned -= pow(2, 16);
}
return new \Nbt\Tag\ShortTag($unsigned);
}
if ($tagType == TagType::TAG_INT) {
$unsigned = $this->unpackNBytes($file, 4, "N");
if ($unsigned >= pow(2, 31)) {
// conert to signed
$unsigned = $unsigned - pow(2, 32);
}
return new \Nbt\Tag\IntTag($unsigned);
}
if ($tagType == TagType::TAG_LONG) {
$first = $this->unpackNBytes($file, 4, "N");
$second = $this->unpackNBytes($file, 4, "N");
return new \Nbt\Tag\LongTag(($first << 32) + $second);
}
if ($tagType == TagType::TAG_FLOAT) {
if ($this->isBigEndian()) {
return new \Nbt\Tag\FloatTag($this->unpackNBytes($file, 4, 'f'));
}
return new \Nbt\Tag\FloatTag($this->unpackNBytes($file, 4, 'f', true));
}
if ($tagType == TagType::TAG_DOUBLE) {
if ($this->isBigEndian()) {
return new \Nbt\Tag\DoubleTag($this->unpackNBytes($file, 8, 'd'));
}
return new \Nbt\Tag\DoubleTag($this->unpackNBytes($file, 8, 'd', true));
}
if ($tagType == TagType::TAG_BYTE_ARRAY) {
$length = $this->readTagDataFromStream($file, TagType::TAG_INT)->getValue();
$out = new \Nbt\Tag\ByteArrayTag();
for ($i = 0; $i < $length; $i++) {
$out->push($this->readTagDataFromStream($file, TagType::TAG_BYTE));
}
return $out;
}
if ($tagType == TagType::TAG_STRING) {
if (!($length = $this->readTagDataFromStream($file, TagType::TAG_SHORT)->getValue())) {
return new \Nbt\Tag\StringTag("");
}
return new \Nbt\Tag\StringTag(fread($file, $length));
}
if ($tagType == TagType::TAG_LIST) {
$type = $this->readTagDataFromStream($file, TagType::TAG_BYTE)->getValue();
$length = $this->readTagDataFromStream($file, TagType::TAG_INT)->getValue();
$out = new \Nbt\Tag\ListTag(TagType::getTagClassName($type));
for ($i = 0; $i < $length; $i++) {
if (feof($file)) {
}
$out->push($this->readTagDataFromStream($file, $type));
}
return $out;
}
if ($tagType == TagType::TAG_COMPOUND) {
$out = new \Nbt\Tag\CompoundTag();
while ($child = $this->readFullTagFromStream($file)) {
$out->add($child);
}
return $out;
}
throw new \Exception("Unsupported type `{$tagType}`");
}
