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package main
import (
"errors"
"fmt"
"github.com/silvasur/gonbt/nbt"
"io"
)
func invalidLevelDat(err error) error {
return fmt.Errorf("Invalid level.dat: %s", err)
}
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
}
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