/
mcadump.go
118 lines (99 loc) · 2.27 KB
/
mcadump.go
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// This is an example of how to use the go-mc/save/region package to read and write .mca files.
// It can unpack .mca files to .mcc files, or repack .mcc files to .mca files, controlled by the -p flags.
package main
import (
"bytes"
"compress/gzip"
"compress/zlib"
"flag"
"fmt"
"io"
"os"
"path/filepath"
"github.com/Tnze/go-mc/save/region"
)
var (
decomp = flag.Bool("x", false, "decompress each chunk to NBT format")
repack = flag.Bool("p", false, "repack .mcc file to .mca")
)
func main() {
flag.Usage = usage
flag.Parse()
args := flag.Args()
var o string
o = "." // output dir
if len(args) < 2 {
usage()
}
for _, f := range args[1:] {
fs := must(filepath.Glob(f))
if *repack {
for _, f := range fs {
pack(f, o)
}
} else {
for _, f := range fs {
unpack(f, o)
}
}
}
}
func usage() {
_, _ = fmt.Fprintf(os.Stderr, "usage: %s [-x] [-r] r.<X>.<Z>.mc{a,c}\n", os.Args[0])
os.Exit(1)
}
func unpack(f, o string) {
var x, z int
rn := filepath.Base(f)
must(fmt.Sscanf(rn, "r.%d.%d.mca", &x, &z))
r := must(region.Open(f))
defer r.Close()
for i := 0; i < 32; i++ {
for j := 0; j < 32; j++ {
if !r.ExistSector(i, j) {
continue
}
data := must(r.ReadSector(i, j))
var r io.Reader = bytes.NewReader(data[1:])
fn := fmt.Sprintf("c.%d.%d.mcc", x<<5+i, z<<5+j)
if *decomp {
var err error
fn += ".nbt" // 解压后就是一个标准的NBT文件,可以加个.nbt后缀
switch data[0] {
default:
err = fmt.Errorf("unknown compression type 0x%02x", data[0])
case 1:
r, err = gzip.NewReader(r)
case 2:
r, err = zlib.NewReader(r)
}
must(0, err)
}
cf := must(os.OpenFile(filepath.Join(o, fn), os.O_CREATE|os.O_RDWR|os.O_EXCL, 0o666))
must(io.Copy(cf, r))
}
}
}
func pack(f, o string) {
var x, z int
rn := filepath.Base(f)
must(fmt.Sscanf(rn, "c.%d.%d.mcc", &x, &z))
fn := fmt.Sprintf("r.%d.%d.mca", x>>5, z>>5)
r, err := region.Open(fn)
if err != nil && os.IsNotExist(err) {
r = must(region.Create(filepath.Join(o, fn)))
} else {
must(0, err)
}
defer r.Close()
mcc := must(os.ReadFile(f))
rx, rz := region.In(x, z)
must(0, r.WriteSector(rx, rz, mcc))
}
func must[T any](v T, err error) T {
if err != nil {
_, _ = fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
return v
}