func (pc *preChunk) getLevelTag() (nbt.TagCompound, error) {
r := bytes.NewReader(pc.data)
var root nbt.Tag
var err error
switch pc.compression {
case compressGZip:
root, _, err = nbt.ReadGzipdNamedTag(r)
case compressZlib:
root, _, err = nbt.ReadZlibdNamedTag(r)
default:
err = UnknownCompression
}
if err != nil {
return nil, err
}
if root.Type != nbt.TAG_Compound {
return nil, errors.New("Root tag is not a TAG_Compound")
}
lvl, err := root.Payload.(nbt.TagCompound).GetCompound("Level")
if err != nil {
return nil, fmt.Errorf("Could not read Level tag: %s", err)
}
return lvl, nil
}
func getMapCenter(leveldat io.Reader) (int, int, error) {
lvl, _, err := nbt.ReadGzipdNamedTag(leveldat)
if err != nil {
return 0, 0, err
}
if lvl.Type != nbt.TAG_Compound {
return 0, 0, invalidLevelDat(errors.New("Root tag has wrong type"))
}
root := lvl.Payload.(nbt.TagCompound)
data, err := root.GetCompound("Data")
if err != nil {
return 0, 0, invalidLevelDat(err)
}
x, err := data.GetInt("SpawnX")
if err != nil {
return 0, 0, invalidLevelDat(err)
}
z, err := data.GetInt("SpawnZ")
if err != nil {
return 0, 0, invalidLevelDat(err)
}
return int(x), int(z), nil
}