119 lines
2.3 KiB
Go
119 lines
2.3 KiB
Go
// This is an example of how to use the go-mc/save/region package to read and write .mca files.
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// It can unpack .mca files to .mcc files, or repack .mcc files to .mca files, controlled by the -p flags.
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package main
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import (
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"bytes"
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"compress/gzip"
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"compress/zlib"
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"flag"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"github.com/Tnze/go-mc/save/region"
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)
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var (
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decomp = flag.Bool("x", false, "decompress each chunk to NBT format")
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repack = flag.Bool("p", false, "repack .mcc file to .mca")
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)
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func main() {
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flag.Usage = usage
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flag.Parse()
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args := flag.Args()
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var o string
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o = "." // output dir
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if len(args) < 2 {
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usage()
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}
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for _, f := range args[1:] {
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fs := must(filepath.Glob(f))
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if *repack {
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for _, f := range fs {
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pack(f, o)
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}
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} else {
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for _, f := range fs {
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unpack(f, o)
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}
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}
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}
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}
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func usage() {
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_, _ = fmt.Fprintf(os.Stderr, "usage: %s [-x] [-r] r.<X>.<Z>.mc{a,c}\n", os.Args[0])
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os.Exit(1)
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}
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func unpack(f, o string) {
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var x, z int
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rn := filepath.Base(f)
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must(fmt.Sscanf(rn, "r.%d.%d.mca", &x, &z))
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r := must(region.Open(f))
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defer r.Close()
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for i := 0; i < 32; i++ {
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for j := 0; j < 32; j++ {
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if !r.ExistSector(i, j) {
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continue
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}
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data := must(r.ReadSector(i, j))
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var r io.Reader = bytes.NewReader(data[1:])
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fn := fmt.Sprintf("c.%d.%d.mcc", x<<5+i, z<<5+j)
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if *decomp {
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var err error
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fn += ".nbt" // 解压后就是一个标准的NBT文件，可以加个.nbt后缀
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switch data[0] {
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default:
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err = fmt.Errorf("unknown compression type 0x%02x", data[0])
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case 1:
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r, err = gzip.NewReader(r)
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case 2:
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r, err = zlib.NewReader(r)
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}
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must(0, err)
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}
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cf := must(os.OpenFile(filepath.Join(o, fn), os.O_CREATE|os.O_RDWR|os.O_EXCL, 0o666))
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must(io.Copy(cf, r))
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}
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}
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}
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func pack(f, o string) {
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var x, z int
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rn := filepath.Base(f)
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must(fmt.Sscanf(rn, "c.%d.%d.mcc", &x, &z))
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fn := fmt.Sprintf("r.%d.%d.mca", x>>5, z>>5)
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r, err := region.Open(fn)
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if err != nil && os.IsNotExist(err) {
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r = must(region.Create(filepath.Join(o, fn)))
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} else {
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must(0, err)
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}
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defer r.Close()
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mcc := must(os.ReadFile(f))
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rx, rz := region.In(x, z)
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must(0, r.WriteSector(rx, rz, mcc))
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}
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func must[T any](v T, err error) T {
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if err != nil {
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_, _ = fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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return v
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}
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