infer compress type before decode NBT fail

save/level.go

@@ -0,0 +1,4 @@
+package save
+
+type Level struct {
+}

save/playerdata.go

@@ -0,0 +1,16 @@
+package save
+
+import (
+	"github.com/Tnze/go-mc/nbt"
+	"io"
+)
+
+type PlayerData struct {
+	Pos    [3]float64
+	Motion [3]float64
+}
+
+func ReadPlayerData(r io.Reader) (data PlayerData, err error) {
+	err = nbt.NewDecoder(r).Decode(&data)
+	return
+}

save/playerdata_test.go

@@ -0,0 +1,33 @@
+package save
+
+import (
+	"compress/gzip"
+	"os"
+	"testing"
+)
+
+func TestPlayerData(t *testing.T) {
+	f, err := os.Open("testdata/playerdata/58f6356e-b30c-4811-8bfc-d72a9ee99e73.dat")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	r, err := gzip.NewReader(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	data, err := ReadPlayerData(r)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	want := PlayerData{
+		Pos:    [3]float64{-41.5, 65, -89.5},
+		Motion: [3]float64{0, -0.0784000015258789, 0},
+	}
+
+	if data != want {
+		t.Errorf("player data parse error: get %v, want %v", data, want)
+	}
+}

save/save.go

@@ -0,0 +1 @@
+package save

save/testdata/advancements/58f6356e-b30c-4811-8bfc-d72a9ee99e73.json

@@ -0,0 +1,9 @@
+{
+  "minecraft:adventure/adventuring_time": {
+    "criteria": {
+      "minecraft:plains": "2019-07-31 15:56:59 +0800"
+    },
+    "done": false
+  },
+  "DataVersion": 1976
+}

save/testdata/stats/58f6356e-b30c-4811-8bfc-d72a9ee99e73.json

@@ -0,0 +1 @@
+{"stats":{"minecraft:custom":{"minecraft:time_since_rest":6,"minecraft:play_one_minute":6,"minecraft:leave_game":1,"minecraft:time_since_death":6}},"DataVersion":1976}