add placeholder replacement and formatting utility functions

start work on mca to packet conversion

.gitattributes

@@ -1,2 +1,6 @@
 **/*_test.go export-ignore
 **/testdata export-ignore
+*.zip filter=lfs diff=lfs merge=lfs -text
+*.tmcpr filter=lfs diff=lfs merge=lfs -text
+*.mcpr filter=lfs diff=lfs merge=lfs -text
+*.mca filter=lfs diff=lfs merge=lfs -text

.github/workflows/go.yml

@@ -14,15 +14,22 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - name: Checkout with LFS
+      uses: actions/checkout@v4
+      with:
+        lfs: true
+
 
     - name: Set up Go
       uses: actions/setup-go@v4
       with:
-        go-version: '1.25'
+        go-version: '1.26.2'
 
     - name: Build
       run: go build -v ./...
 
+    - name: Vet
+      run: go vet -v ./...
+
     - name: Test
       run: go test -v ./...

cmd/strom/main.go

@@ -13,8 +13,10 @@ import (
 	"github.com/admin-else/strom/cmd/strom/data"
 	"github.com/admin-else/strom/cmd/strom/extract_mca"
 	"github.com/admin-else/strom/cmd/strom/offline_uuid"
+	"github.com/admin-else/strom/cmd/strom/packet_info"
 	"github.com/admin-else/strom/cmd/strom/packet_inspector"
 	"github.com/admin-else/strom/cmd/strom/print_nbt"
+	"github.com/admin-else/strom/cmd/strom/print_replay"
 	"github.com/admin-else/strom/cmd/strom/status"
 )
 
@@ -36,6 +38,7 @@ func Version(args []string) (err error) {
 
 var subcommands = map[string]func(args []string) error{
 	"offline-uuid": offline_uuid.Run,
+	"packet-info":  packet_info.Run,
 	"print-nbt":    print_nbt.Run,
 	"status":       status.Run,
 	"packet-spy":   packet_inspector.Run,
@@ -43,6 +46,7 @@ var subcommands = map[string]func(args []string) error{
 	"version":      Version,
 	"extract-mca":  extract_mca.Run,
 	"data":         data.Run,
+	"print-replay": print_replay.Run,
 }
 
 func Help(args []string) (err error) {
@@ -53,15 +57,9 @@ func Help(args []string) (err error) {
 }
 
 func mainE() (err error) {
-	subcommands["help"] = Help // this is here because if it isn't tools/cli/main.go:17:5: initialization cycle for subcommands
-	//	tools/cli/main.go:17:5: subcommands refers to Help
-	//	tools/cli/main.go:22:6: Help refers to subcommands
+	subcommands["help"] = Help
 	args := os.Args
 
-	// Debug stuff
-	slog.SetLogLoggerLevel(slog.LevelDebug)
-	//args = []string{"TEST", "version"}
-
 	if len(args) < 2 {
 		err = ExpectedASubcommandErr
 		return

cmd/strom/packet_info/main.go

@@ -0,0 +1,169 @@
+package packet_info
+
+import (
+	"flag"
+	"fmt"
+	"strconv"
+
+	"github.com/admin-else/strom/data"
+	"github.com/admin-else/strom/proto"
+	"github.com/admin-else/strom/proto_base"
+	"github.com/admin-else/strom/proto_generated"
+)
+
+var cmd = flag.NewFlagSet("packet-info", flag.ContinueOnError)
+var versionFlag = cmd.String("version", "", "protocol version or minecraft version name")
+var stateFlag = cmd.String("state", "", "handshaking, status, login, configuration, play")
+var directionFlag = cmd.String("direction", "", "toserver, toclient")
+var idFlag = cmd.Int("id", -1, "packet id")
+var nameFlag = cmd.String("name", "", "packet name")
+
+func Run(args []string) (err error) {
+	err = cmd.Parse(args)
+	if err != nil {
+		return
+	}
+
+	var version int32
+	if *versionFlag != "" {
+		v, err := data.LookUpVersionByName(*versionFlag)
+		if err != nil {
+			v2, err := parseVersion(*versionFlag)
+			if err != nil {
+				return fmt.Errorf("invalid version: %s", *versionFlag)
+			}
+			v, err = data.LookUpVersionByProtocolVersion(v2)
+			if err != nil {
+				return err
+			}
+		}
+		version = v.Version
+	}
+
+	var state proto_base.State
+	if *stateFlag != "" {
+		state, err = parseState(*stateFlag)
+		if err != nil {
+			return
+		}
+	}
+
+	var direction proto_base.Direction
+	if *directionFlag != "" {
+		direction, err = parseDirection(*directionFlag)
+		if err != nil {
+			return
+		}
+	}
+
+	if *idFlag != -1 && *nameFlag != "" {
+		err = fmt.Errorf("cannot specify both id and name")
+		return
+	}
+
+	if *idFlag != -1 {
+		if *versionFlag == "" || *stateFlag == "" || *directionFlag == "" {
+			err = fmt.Errorf("version, state, and direction are required when looking up by id")
+			return
+		}
+		p, ok := proto.LookUpTypeByPacketInfo(direction, state, int32(*idFlag), version)
+		if !ok {
+			err = fmt.Errorf("packet not found")
+			return
+		}
+		printPacketInfo(p)
+		return
+	}
+
+	if *nameFlag != "" {
+		if *versionFlag == "" {
+			err = fmt.Errorf("version is required when looking up by name")
+			return
+		}
+		if state != 0 || direction != 0 {
+			p, ok := proto.LookupPacketInfoByNameProtocolVersionStateAndDirection(*nameFlag, version, state, direction)
+			if !ok {
+				err = fmt.Errorf("packet not found")
+				return
+			}
+			printPacketInfo(p)
+		} else {
+			var found bool
+			for _, p := range proto_generated.Packets {
+				if p.Name == *nameFlag && p.ProtocolVersion == version {
+					printPacketInfo(p)
+					found = true
+				}
+			}
+			if !found {
+				err = fmt.Errorf("packet not found")
+			}
+		}
+		return
+	}
+
+	err = fmt.Errorf("must specify either -id or -name")
+	return
+}
+
+func parseState(s string) (proto_base.State, error) {
+	switch s {
+	case "handshaking":
+		return proto_base.Handshaking, nil
+	case "status":
+		return proto_base.Status, nil
+	case "login":
+		return proto_base.Login, nil
+	case "configuration":
+		return proto_base.Configuration, nil
+	case "play":
+		return proto_base.Play, nil
+	default:
+		return 0, fmt.Errorf("unknown state: %s", s)
+	}
+}
+
+func parseDirection(s string) (proto_base.Direction, error) {
+	switch s {
+	case "toserver":
+		return proto_base.ToServer, nil
+	case "toclient":
+		return proto_base.ToClient, nil
+	default:
+		return 0, fmt.Errorf("unknown direction: %s", s)
+	}
+}
+
+func parseVersion(val string) (int32, error) {
+	v, err := strconv.ParseInt(val, 10, 32)
+	if err != nil {
+		return 0, err
+	}
+	return int32(v), nil
+}
+
+func printPacketInfo(p proto_base.PacketInfo) {
+	v, _ := data.LookUpVersionByProtocolVersion(p.ProtocolVersion)
+	fmt.Printf("Name:       %s\n", p.Name)
+	fmt.Printf("ID:         %d\n", p.PacketId)
+	fmt.Printf("State:      %s\n", stateToString(p.State))
+	fmt.Printf("Direction:  %s\n", p.Direction)
+	fmt.Printf("Version:    %d (%s)\n", p.ProtocolVersion, v.MinecraftVersion)
+}
+
+func stateToString(s proto_base.State) string {
+	switch s {
+	case proto_base.Handshaking:
+		return "handshaking"
+	case proto_base.Status:
+		return "status"
+	case proto_base.Login:
+		return "login"
+	case proto_base.Configuration:
+		return "configuration"
+	case proto_base.Play:
+		return "play"
+	default:
+		return "unknown"
+	}
+}

cmd/strom/print_replay/failed_packet.go.tmpl

@@ -4,13 +4,13 @@ import (
 	"bytes"
 	"testing"
 
-	"github.com/admin-else/strom/proto_generated/v1_21_8"
+    generated "github.com/admin-else/strom/proto_generated/%v"
 )
 
 // Error: %v
 func TestFailedPacket%10X(t *testing.T) {
-	p := v1_21_8.Play%vPacket{}
-	b := bytes.NewBuffer(%#v)
+    p := &generated.%v{}
+    b := bytes.NewBuffer(%#v)
 	err := p.Decode(b)
 	if err != nil {
 		t.Fatal(err)

cmd/strom/print_replay/main.go

@@ -0,0 +1,161 @@
+package print_replay
+
+import (
+	"bytes"
+	"crypto/sha256"
+	_ "embed"
+	"encoding/binary"
+	"errors"
+	"flag"
+	"fmt"
+	"io"
+	"log/slog"
+	"os"
+	"reflect"
+	"strings"
+
+	"github.com/admin-else/strom/data"
+	"github.com/admin-else/strom/proto"
+	"github.com/admin-else/strom/proto_base"
+)
+
+var (
+	cmd             = flag.NewFlagSet("print-replay", flag.ContinueOnError)
+	FileFlag        = cmd.String("file", "", "The tmcpr file to print")
+	ProtocolVersion = cmd.Int("protocol", -1, "The protocol version")
+	CreateTestsPath = cmd.String("create-tests", "", "")
+	StateFlag       = cmd.String("state", "login", "Initial state: login, config, play")
+)
+
+// TODO: maybe use the proto replay api
+
+//go:embed failed_packet.go.tmpl
+var TestSrcF string
+
+func SaveUnCodeAbleAsTest(packet *proto.UnCodablePacket) {
+	hUntrimmed := sha256.Sum256(packet.Data)
+	h := hUntrimmed[:8]
+	f, err := os.Create(fmt.Sprintf(*CreateTestsPath+"/%v_%10x_test.go", len(packet.Data), h))
+	if err != nil {
+		panic(err)
+	}
+
+	ret, err := data.LookUpVersionByProtocolVersion(packet.Info.ProtocolVersion)
+	if err != nil {
+		panic(err)
+	}
+	goPackage := "v" + strings.ReplaceAll(ret.MinecraftVersion, ".", "_")
+
+	//goland:noinspection GoUnhandledErrorResult
+	defer f.Close()
+	_, err = fmt.Fprintf(f, TestSrcF, goPackage, packet.Err, h, reflect.TypeOf(packet.Info.Type).Elem().Name(), packet.Data)
+	if err != nil {
+		panic(err)
+	}
+	slog.Info("Packet failed to parse", "error", packet.Err, "saved", f.Name(), "data", fmt.Sprintf("%q", packet.Data))
+}
+
+var state = proto_base.Login
+
+func UnpackPacket(r io.Reader) (packet proto_base.EncodeDecodeAble, err error) {
+	var timestamp, length uint32
+	err = binary.Read(r, binary.BigEndian, &timestamp)
+	if err != nil {
+		return
+	}
+	err = binary.Read(r, binary.BigEndian, &length)
+	if err != nil {
+		return
+	}
+
+	// Read the packet data into a byte slice
+	packetData := make([]byte, length)
+	_, err = io.ReadFull(r, packetData)
+	if err != nil {
+		return
+	}
+
+	// Use bytes.Reader instead of bytes.Buffer
+	b := bytes.NewReader(packetData)
+
+	packetId, err := proto_base.DecodeVarInt(b)
+	if err != nil {
+		return
+	}
+
+	// Calculate position after reading the packet ID
+	// indexafterid represents how many bytes we've read so far
+	indexafterid := int(b.Size()) - b.Len()
+
+	i, ok := proto.LookUpTypeByPacketInfo(proto_base.ToClient, state, packetId, int32(*ProtocolVersion))
+	if !ok {
+		packet = &proto.UnCodablePacket{Err: proto.BadPacketIdErr, Data: packetData, Info: i}
+		return
+	}
+	packet = reflect.New(reflect.TypeOf(i.Type).Elem()).Interface().(proto_base.EncodeDecodeAble)
+	err = packet.Decode(b)
+	if err != nil {
+		packet = &proto.UnCodablePacket{Err: err, Data: packetData[indexafterid:], Info: i}
+		return
+	}
+	switch i.Name {
+	case "success":
+		state = proto_base.Configuration
+	case "finish_configuration":
+		state = proto_base.Play
+	}
+	return
+}
+
+func Run(args []string) (err error) {
+	err = cmd.Parse(args)
+	if err != nil {
+		return
+	}
+	if *ProtocolVersion == -1 {
+		return fmt.Errorf("no protocol version specified")
+	}
+	if *FileFlag == "" {
+		return fmt.Errorf("no file specified")
+	}
+	switch *StateFlag {
+	case "login":
+		state = proto_base.Login
+	case "config":
+		state = proto_base.Configuration
+	case "play":
+		state = proto_base.Play
+	default:
+		return fmt.Errorf("unknown state: %s", *StateFlag)
+	}
+	f, err := os.Open(*FileFlag)
+	if err != nil {
+		return
+	}
+	defer f.Close()
+
+	var totalPackets, failedPackets int
+	for {
+		var packet proto_base.EncodeDecodeAble
+		packet, err = UnpackPacket(f)
+		unCodablePacket, ok := packet.(*proto.UnCodablePacket)
+		if ok {
+			if *CreateTestsPath != "" {
+				SaveUnCodeAbleAsTest(unCodablePacket)
+			}
+			failedPackets++
+		}
+
+		if err != nil {
+			fmt.Println(err)
+		} else {
+			fmt.Printf("Packet: %#v\n", packet)
+		}
+		if errors.Is(err, io.EOF) {
+			break
+		}
+		totalPackets++
+	}
+	fmt.Printf("Total packets: %d, failed packets: %d, %%failed: %.2f%%\n", totalPackets, failedPackets, float64(failedPackets)/float64(totalPackets)*100)
+	return
+}

cmd/strom/print_replay/testdata/2026_04_18_20_07_53.mcpr

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2d90ee976987678593a6b1d09136bb9b4fd131390796ea6e413376a6ddc63226
+size 75035693

cmd/strom/print_replay/testdata/markers.json

@@ -0,0 +1 @@
+[{"realTimestamp":9845034,"value":{"position":{"x":-31.946051078575692,"y":93.0,"z":29.523387113769626,"yaw":-627.44653,"pitch":37.573395,"roll":0.0}}},{"realTimestamp":9845138,"value":{"position":{"x":-31.946051078575692,"y":93.0,"z":29.523387113769626,"yaw":-627.44653,"pitch":37.573395,"roll":0.0}}},{"realTimestamp":9844902,"value":{"position":{"x":-31.946051078575692,"y":93.0,"z":29.523387113769626,"yaw":-627.44653,"pitch":37.573395,"roll":0.0}}},{"realTimestamp":9908896,"value":{"position":{"x":-1.6053634059630886,"y":91.672484820985,"z":-10.594536888795163,"yaw":-1151.6353,"pitch":16.142092,"roll":0.0}}},{"realTimestamp":9844750,"value":{"position":{"x":-31.946051078575692,"y":93.0,"z":29.523387113769626,"yaw":-627.44653,"pitch":37.573395,"roll":0.0}}},{"realTimestamp":9853735,"value":{"position":{"x":-31.05268144454021,"y":88.0,"z":-25.371850030366133,"yaw":-624.37897,"pitch":16.105839,"roll":0.0}}},{"realTimestamp":9845690,"value":{"position":{"x":-31.946051078575692,"y":93.0,"z":29.523387113769626,"yaw":-627.44653,"pitch":37.573395,"roll":0.0}}},{"realTimestamp":9938194,"value":{"position":{"x":39.88206777447001,"y":103.87657142499006,"z":58.09267383764874,"yaw":-1781.1023,"pitch":37.354122,"roll":0.0}}},{"realTimestamp":9846991,"value":{"position":{"x":-31.946051078575692,"y":93.0,"z":29.523387113769626,"yaw":-628.46875,"pitch":36.04,"roll":0.0}}},{"realTimestamp":9908638,"value":{"position":{"x":-1.5870303355717672,"y":91.672484820985,"z":-11.359450846926011,"yaw":-1142.6902,"pitch":20.997843,"roll":0.0}}},{"realTimestamp":9845490,"value":{"position":{"x":-31.946051078575692,"y":93.0,"z":29.523387113769626,"yaw":-627.44653,"pitch":37.573395,"roll":0.0}}},{"realTimestamp":9845990,"value":{"position":{"x":-31.946051078575692,"y":93.0,"z":29.523387113769626,"yaw":-627.44653,"pitch":37.573395,"roll":0.0}}}]

cmd/strom/print_replay/testdata/medium/2026_04_18_19_02_21.mcpr

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d972b9b5f9d962199fe262eccef32a4b94504283fae97f9963702e7ab1550129
+size 437123

cmd/strom/print_replay/testdata/medium/metaData.json

@@ -0,0 +1 @@
+{"singleplayer":false,"serverName":"protect-test-server.anygate.cloud","customServerName":"proxied test server","duration":3368,"date":1776531741320,"mcversion":"1.21.11","fileFormat":"MCPR","fileFormatVersion":14,"protocol":774,"generator":"ReplayMod v1.21.11-2.6.26","selfId":-1,"players":[]}

cmd/strom/print_replay/testdata/medium/mods.json

@@ -0,0 +1 @@
+{"requiredMods":[{"modID":"viafabricplus","modName":"ViaFabricPlus","modVersion":"4.4.4"}]}

cmd/strom/print_replay/testdata/medium/recording.tmcpr

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cef58ec0e3d1d25e34c2effc5c09241ee4c1b39c085ed9e11b7097dfd5c2d033
+size 3429878

cmd/strom/print_replay/testdata/medium/recording.tmcpr.crc32

@@ -0,0 +1 @@
+234002168

cmd/strom/print_replay/testdata/metaData.json

@@ -0,0 +1 @@
+{"singleplayer":false,"serverName":"protect-beta.anygate.cloud","customServerName":"protect-beta.anygate.cloud","duration":10198341,"date":1776535673280,"mcversion":"1.21.11","fileFormat":"MCPR","fileFormatVersion":14,"protocol":774,"generator":"ReplayMod v1.21.11-2.6.26","selfId":-1,"players":["fe2d6f64-7ab0-3373-a526-af097abbcb39"]}

cmd/strom/print_replay/testdata/mods.json

@@ -0,0 +1 @@
+{"requiredMods":[{"modID":"viafabricplus","modName":"ViaFabricPlus","modVersion":"4.4.4"}]}

cmd/strom/print_replay/testdata/recording.tmcpr

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:be007aa681f7959708e89e39e05390e228753291823a18274068d310a50aa78b
+size 526306397

cmd/strom/print_replay/testdata/recording.tmcpr.crc32

@@ -0,0 +1 @@
+270566013

cmd/strom/print_replay/testdata/small/2026_04_21_22_30_31.mcpr

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0da58f5cdd65ef241df8c61f9e633af7317faa77034183d4fb648b039c1e14ed
+size 842

cmd/strom/print_replay/testdata/small/metaData.json

@@ -0,0 +1 @@
+{"singleplayer":false,"serverName":"protect-test-server.anygate.cloud","customServerName":"proxied test server","duration":476,"date":1776803431635,"mcversion":"1.21.11","fileFormat":"MCPR","fileFormatVersion":14,"protocol":774,"generator":"ReplayMod v1.21.11-2.6.26","selfId":-1,"players":[]}

cmd/strom/print_replay/testdata/small/mods.json

@@ -0,0 +1 @@
+{"requiredMods":[{"modID":"viafabricplus","modName":"ViaFabricPlus","modVersion":"4.4.4"}]}

cmd/strom/print_replay/testdata/small/recording.tmcpr

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:52fa049f97918289e018fa4c3bf5ff789d4f99f44f590ad875ce1f65e5fa9563
+size 37

cmd/strom/print_replay/testdata/small/recording.tmcpr.crc32

@@ -0,0 +1 @@
+1105715802

crypto/cfb8.go

@@ -28,6 +28,7 @@ package crypto
 import (
 	"crypto/cipher"
 	"crypto/subtle"
+	"sync"
 	"unsafe"
 )
 
@@ -37,6 +38,7 @@ type CFB8 struct {
 	ivPos     int
 	iv        []byte
 	de        bool
+	mutex     sync.Mutex
 }
 
 func NewCFB8Decrypt(c cipher.Block, iv []byte) *CFB8 {
@@ -59,6 +61,8 @@ func newCFB8(c cipher.Block, iv []byte, de bool) *CFB8 {
 }
 
 func (cf *CFB8) XORKeyStream(dst, src []byte) {
+	cf.mutex.Lock()
+	defer cf.mutex.Unlock()
 	if len(src) == 0 {
 		return
 	}

data/blocks.go

@@ -2,7 +2,10 @@ package data
 
 import (
 	"errors"
+	"slices"
 	"strconv"
+
+	"github.com/admin-else/strom/util"
 )
 
 //  {
@@ -48,6 +51,7 @@ type Block struct {
 type BlockState struct {
 	Name      string
 	Type      string
+	MinValue  int32 // this is generated on load and used for state value calculations
 	NumValues int32 `json:"num_values"`
 	Values    []string
 }
@@ -63,6 +67,20 @@ func BlocksForVersion(v string) (ret []*Block) {
 	var b []*Block
 	must(LoadVersionedJson(v, "blocks", &b))
 	BlocksCache[v] = b
+	for _, block := range b {
+		for i, state := range block.States {
+			if state.Type != "int" {
+				continue
+			}
+			values := make([]int32, state.NumValues)
+			for j, stateValue := range state.Values {
+				n := util.MustT(strconv.Atoi(stateValue))
+				values[j] = int32(n)
+			}
+			block.States[i].MinValue = slices.Min(values)
+		}
+	}
+
 	return b
 }
 
@@ -104,7 +122,9 @@ func StateIdFromBlocKAndStateMap(version string, name string, stateMap map[strin
 	} else {
 		stateId, err = b.IdFromStateMap(stateMap)
 	}
-
+	if b.MinStateId > stateId || b.MaxStateId < stateId {
+		err = BlockStateOutOfRangeErr
+	}
 	return
 }
 
@@ -153,7 +173,7 @@ func mcDataBlockStateTypeSerialize(v string, s *BlockState) (n int32, err error)
 	}
 	n1, errMabye := strconv.Atoi(v)
 	if errMabye == nil {
-		return int32(n1), nil
+		return int32(n1) - s.MinValue, nil
 	}
 	for i, enumValue := range s.Values {
 		if enumValue == v {

data/blocks_test.go

@@ -32,3 +32,11 @@ func TestBlockStates(t *testing.T) {
 		t.Fatal("state id mismatch")
 	}
 }
+
+func TestBlockStateOutOfRangeBug(t *testing.T) {
+	id, err := data.StateIdFromBlocKAndStateMap("1.21.11", "wildflowers", map[string]string{"facing": "east", "flower_amount": "4"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("State id: %d", id)
+}

event/event_bus.go

@@ -240,6 +240,9 @@ func NewLoop() (l *Loop) {
 }
 
 func NewLoopCtx(ctx context.Context) (l *Loop) {
+	if ctx == nil {
+		ctx = context.Background()
+	}
 	l = &Loop{}
 	l.Ctx, l.Cancel = context.WithCancel(ctx)
 	l.HandlerFunctions = make(map[reflect.Type][]reflect.Value)

go.mod

@@ -1,9 +1,9 @@
 module github.com/admin-else/strom
 
-go 1.25
+go 1.26.2
 
 require (
-	github.com/go-viper/mapstructure/v2 v2.4.0
+	github.com/go-viper/mapstructure/v2 v2.4.0 // FIXME: this should be replaced with my version
 	github.com/google/go-cmp v0.7.0
 	github.com/google/uuid v1.6.0
 )

level/anvil/chunk.go

@@ -22,6 +22,7 @@ const McPrefix = "minecraft:"
 func (c Chunk) ToStorage(version string) (toChunk *level.Chunk, err error) {
 	f := level.MakeBlockFormat(version)
 	toChunk = new(level.Chunk)
+	toChunk.Version = version
 
 	toChunk.Sections = make([]level.Section, len(c.Sections))
 	for i, s := range c.Sections {
@@ -33,15 +34,30 @@ func (c Chunk) ToStorage(version string) (toChunk *level.Chunk, err error) {
 			}
 		}
 		// this is probably fine
-		uintSlice := unsafe.Slice((*uint64)(unsafe.Pointer(unsafe.SliceData(s.BlockStates.Data))), len(s.BlockStates.Data))
 
-		toChunk.Sections[i].Blocks, err = f.Import(uintSlice, util.BpeByNum(float64(len(s.BlockStates.Palette))), pallete)
-		if err != nil {
-			return
+		if s.BlockStates.Data != nil {
+			uintSlice := unsafe.Slice((*uint64)(unsafe.Pointer(unsafe.SliceData(s.BlockStates.Data))), len(s.BlockStates.Data))
+			bpe := util.BpeByNum(float64(len(s.BlockStates.Palette)))
+			toChunk.Sections[i].Blocks, err = f.Import(uintSlice, bpe, pallete)
+			if err != nil {
+				return
+			}
+			toChunk.Sections[i].BlockCount = int16(level.BlocksPerChunkSection - level.CountStorage(toChunk.Sections[i].Blocks, 0))
+		} else {
+			var fillerId = int32(0)
+			if len(pallete) == 1 {
+				fillerId = pallete[0]
+				if fillerId != 0 {
+					toChunk.Sections[i].BlockCount = level.BlocksPerChunkSection
+				}
+			}
+			toChunk.Sections[i].Blocks, err = f.FullWith(fillerId)
+			if err != nil {
+				return
+			}
 		}
-		toChunk.Sections[i].BlockCount = int16(level.CountStorage(toChunk.Sections[i].Blocks, 0))
 	}
-
+	f = level.MakeBiomeFormat(version)
 	for i, s := range c.Sections {
 		pallete := make([]int32, len(s.Biomes.Palette))
 		for j, p := range s.Biomes.Palette {
@@ -53,12 +69,25 @@ func (c Chunk) ToStorage(version string) (toChunk *level.Chunk, err error) {
 			}
 			pallete[j] = b.Id
 		}
-		// this is probably fine
-		uintSlice := unsafe.Slice((*uint64)(unsafe.Pointer(unsafe.SliceData(s.Biomes.Data))), len(s.Biomes.Data))
 
-		toChunk.Sections[i].Biomes, err = f.Import(uintSlice, util.BpeByNum(float64(len(pallete))), pallete)
-		if err != nil {
-			return
+		if s.Biomes.Data != nil {
+
+			// this is probably fine
+			uintSlice := unsafe.Slice((*uint64)(unsafe.Pointer(unsafe.SliceData(s.Biomes.Data))), len(s.Biomes.Data))
+			bpe := util.BpeByNum(float64(len(pallete)))
+			toChunk.Sections[i].Biomes, err = f.Import(uintSlice, bpe, pallete)
+			if err != nil {
+				return
+			}
+		} else {
+			var fillerId = int32(0)
+			if len(pallete) == 1 {
+				fillerId = pallete[0]
+			}
+			toChunk.Sections[i].Biomes, err = f.FullWith(fillerId)
+			if err != nil {
+				return
+			}
 		}
 	}
 	return
@@ -70,11 +99,11 @@ type Section struct {
 		Data    []int64 `nbt:"data,omitempty"`
 		Palette []struct {
 			Name       string
-			Properties map[string]string `nbt:"properties,omitempty"`
+			Properties map[string]string `nbt:"Properties,omitempty"`
 		}
-	}
+	} `nbt:"block_states,omitempty"`
 	Biomes struct {
 		Data    []int64 `nbt:"data,omitempty"`
 		Palette []string
-	}
+	} `nbt:"biomes,omitempty"`
 }

level/anvil/level_test.go

@@ -1,11 +1,13 @@
 package anvil_test
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"os"
 	"testing"
 
+	"github.com/admin-else/strom/level"
 	"github.com/admin-else/strom/level/anvil"
 	"github.com/admin-else/strom/util"
 )
@@ -44,11 +46,8 @@ func TestRegionFile(t *testing.T) {
 	fmt.Println("Chunk loaded successfully")
 }
 
-func TestConverToPacket(t *testing.T) {
-	f, err := os.Open("./level/anvil/testdata/r.0.0.mca")
-	if err != nil {
-		return
-	}
-	defer f.Close()
-
+func loadPacketToChunk(b []byte) (chunk *level.Chunk, err error) {
+	buffer := bytes.NewBuffer(b)
+	chunk, err = level.ReadChunkFromChunkPacketData(buffer, "1.21.11", 384)
+	return
 }

level/anvil/mca.go

@@ -62,12 +62,17 @@ func ReadChunkHeader(r *os.File) (ch *ChunkHeader, err error) {
 	return
 }
 
+// ChunkAt returns the chunk at the given position, or nil if it is empty.
 func (c *ChunkHeader) ChunkAt(f *os.File, x, z int32) (n *nbt.Tag, err error) {
 	if x < 0 || z < 0 || x >= ChunksWidthRegionFile || z >= ChunksWidthRegionFile {
 		err = fmt.Errorf("chunk out of bounds")
 		return
 	}
 	off, size := chunkLocation(c.Chunk[chunkXZtoIndex(x, z)])
+	if off == 0 {
+		return nil, nil
+	}
+
 	_, err = f.Seek(int64(off), 0)
 	if err != nil {
 		return

level/anvil/testdata/securechattestworld/advancements/08fd2e8e-f648-45b8-a809-cb9dcaf15d2c.json

@@ -0,0 +1,215 @@
+{
+  "minecraft:recipes/building_blocks/polished_deepslate": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_tile_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_brick_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/combat/stone_sword": {
+    "criteria": {
+      "has_cobblestone": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/tools/stone_axe": {
+    "criteria": {
+      "has_cobblestone": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:story/mine_stone": {
+    "criteria": {
+      "get_stone": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/furnace": {
+    "criteria": {
+      "has_cobblestone": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/chiseled_deepslate_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/crafting_table": {
+    "criteria": {
+      "unlock_right_away": "2026-01-18 19:40:40 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_slab": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/cobbled_deepslate_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/food/cooked_porkchop_from_campfire_cooking": {
+    "criteria": {
+      "has_porkchop": "2026-01-18 19:40:40 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/cobbled_deepslate_wall": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/polished_deepslate_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/polished_deepslate_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/deepslate_brick_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/polished_deepslate_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/polished_deepslate_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/food/cooked_porkchop": {
+    "criteria": {
+      "has_porkchop": "2026-01-18 19:40:40 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/tools/stone_pickaxe": {
+    "criteria": {
+      "has_cobblestone": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_brick_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_tile_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/misc/charcoal": {
+    "criteria": {
+      "has_log": "2026-01-18 19:41:43 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_stairs": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/deepslate_tile_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/oak_planks": {
+    "criteria": {
+      "has_logs": "2026-01-18 19:41:43 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/food/cooked_porkchop_from_smoking": {
+    "criteria": {
+      "has_porkchop": "2026-01-18 19:40:40 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_bricks_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:adventure/adventuring_time": {
+    "criteria": {
+      "minecraft:forest": "2026-01-18 19:40:40 +0100",
+      "minecraft:deep_dark": "2026-01-18 19:41:56 +0100",
+      "minecraft:stony_shore": "2026-01-18 19:40:46 +0100"
+    },
+    "done": false
+  },
+  "minecraft:recipes/building_blocks/deepslate_tiles_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/tools/stone_hoe": {
+    "criteria": {
+      "has_cobblestone": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/tools/stone_shovel": {
+    "criteria": {
+      "has_cobblestone": "2026-01-18 19:41:36 +0100"
+    },
+    "done": true
+  },
+  "DataVersion": 4556
+}

level/anvil/testdata/securechattestworld/advancements/2e2bbed4-8d1c-3b2c-8673-c561c520e4f2.json

@@ -0,0 +1,17 @@
+{
+  "minecraft:recipes/decorations/crafting_table": {
+    "criteria": {
+      "unlock_right_away": "2026-04-23 22:08:36 +0200"
+    },
+    "done": true
+  },
+  "minecraft:adventure/adventuring_time": {
+    "criteria": {
+      "minecraft:taiga": "2026-04-23 22:10:55 +0200",
+      "minecraft:grove": "2026-04-23 22:09:03 +0200",
+      "minecraft:stony_shore": "2026-04-23 22:08:37 +0200"
+    },
+    "done": false
+  },
+  "DataVersion": 4671
+}

level/anvil/testdata/securechattestworld/advancements/37e4a5df-2479-34b7-be52-2f491341f6b1.json

@@ -0,0 +1,17 @@
+{
+  "minecraft:recipes/decorations/crafting_table": {
+    "criteria": {
+      "unlock_right_away": "2026-05-08 20:07:02 +0200"
+    },
+    "done": true
+  },
+  "minecraft:adventure/adventuring_time": {
+    "criteria": {
+      "minecraft:forest": "2026-05-08 20:07:06 +0200",
+      "minecraft:taiga": "2026-05-08 20:07:05 +0200",
+      "minecraft:grove": "2026-05-08 20:07:03 +0200"
+    },
+    "done": false
+  },
+  "DataVersion": 4671
+}

level/anvil/testdata/securechattestworld/advancements/b24e58a9-7e4c-3f19-91fc-3074c8cfe34b.json

@@ -0,0 +1,220 @@
+{
+  "minecraft:recipes/building_blocks/polished_deepslate": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_tile_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_brick_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/combat/stone_sword": {
+    "criteria": {
+      "has_cobblestone": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/tools/stone_axe": {
+    "criteria": {
+      "has_cobblestone": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:story/mine_stone": {
+    "criteria": {
+      "get_stone": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/furnace": {
+    "criteria": {
+      "has_cobblestone": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/chiseled_deepslate_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/crafting_table": {
+    "criteria": {
+      "unlock_right_away": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_slab": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/cobbled_deepslate_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/food/cooked_porkchop_from_campfire_cooking": {
+    "criteria": {
+      "has_porkchop": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/cobbled_deepslate_wall": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/polished_deepslate_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/polished_deepslate_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/deepslate_brick_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/polished_deepslate_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/polished_deepslate_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/food/cooked_porkchop": {
+    "criteria": {
+      "has_porkchop": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/tools/stone_pickaxe": {
+    "criteria": {
+      "has_cobblestone": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_brick_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_tile_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/misc/charcoal": {
+    "criteria": {
+      "has_log": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_stairs": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/combat/stone_spear": {
+    "criteria": {
+      "has_cobblestone": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/deepslate_tile_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/oak_planks": {
+    "criteria": {
+      "has_logs": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/food/cooked_porkchop_from_smoking": {
+    "criteria": {
+      "has_porkchop": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_bricks_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:adventure/adventuring_time": {
+    "criteria": {
+      "minecraft:stony_shore": "2026-03-11 19:22:59 +0100",
+      "minecraft:plains": "2026-03-11 19:22:38 +0100"
+    },
+    "done": false
+  },
+  "minecraft:recipes/building_blocks/deepslate_tiles_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/tools/stone_hoe": {
+    "criteria": {
+      "has_cobblestone": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/tools/stone_shovel": {
+    "criteria": {
+      "has_cobblestone": "2026-03-11 19:22:37 +0100"
+    },
+    "done": true
+  },
+  "DataVersion": 4671
+}

level/anvil/testdata/securechattestworld/advancements/beda00ca-0100-3611-a6b5-c0b153e0dc2e.json

@@ -0,0 +1,222 @@
+{
+  "minecraft:recipes/building_blocks/polished_deepslate": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_tile_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_brick_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/combat/stone_sword": {
+    "criteria": {
+      "has_cobblestone": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/tools/stone_axe": {
+    "criteria": {
+      "has_cobblestone": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:story/mine_stone": {
+    "criteria": {
+      "get_stone": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/furnace": {
+    "criteria": {
+      "has_cobblestone": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/chiseled_deepslate_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/crafting_table": {
+    "criteria": {
+      "unlock_right_away": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_slab": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/cobbled_deepslate_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/food/cooked_porkchop_from_campfire_cooking": {
+    "criteria": {
+      "has_porkchop": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/cobbled_deepslate_wall": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/polished_deepslate_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/polished_deepslate_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/deepslate_brick_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/polished_deepslate_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/polished_deepslate_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/food/cooked_porkchop": {
+    "criteria": {
+      "has_porkchop": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/tools/stone_pickaxe": {
+    "criteria": {
+      "has_cobblestone": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_brick_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_tile_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/misc/charcoal": {
+    "criteria": {
+      "has_log": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_stairs": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/combat/stone_spear": {
+    "criteria": {
+      "has_cobblestone": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/deepslate_tile_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/oak_planks": {
+    "criteria": {
+      "has_logs": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/food/cooked_porkchop_from_smoking": {
+    "criteria": {
+      "has_porkchop": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_bricks_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:adventure/adventuring_time": {
+    "criteria": {
+      "minecraft:forest": "2026-02-07 19:19:04 +0100",
+      "minecraft:river": "2026-02-07 19:20:26 +0100",
+      "minecraft:stony_shore": "2026-02-07 19:20:11 +0100",
+      "minecraft:plains": "2026-02-07 19:20:12 +0100"
+    },
+    "done": false
+  },
+  "minecraft:recipes/building_blocks/deepslate_tiles_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/tools/stone_hoe": {
+    "criteria": {
+      "has_cobblestone": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/tools/stone_shovel": {
+    "criteria": {
+      "has_cobblestone": "2026-02-07 19:19:03 +0100"
+    },
+    "done": true
+  },
+  "DataVersion": 4671
+}

level/anvil/testdata/securechattestworld/advancements/de358e9d-8e5f-32cd-b09f-d8bdf3008cfe.json

@@ -0,0 +1,119 @@
+{
+  "minecraft:recipes/decorations/crafting_table": {
+    "criteria": {
+      "unlock_right_away": "2025-11-30 09:32:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/transportation/cherry_boat": {
+    "criteria": {
+      "in_water": "2025-11-30 10:05:13 +0100"
+    },
+    "done": true
+  },
+  "minecraft:adventure/kill_all_mobs": {
+    "criteria": {
+      "minecraft:zombie": "2025-11-30 10:06:33 +0100"
+    },
+    "done": false
+  },
+  "minecraft:recipes/food/cooked_porkchop_from_campfire_cooking": {
+    "criteria": {
+      "has_porkchop": "2025-11-30 10:06:57 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/transportation/bamboo_raft": {
+    "criteria": {
+      "in_water": "2025-11-30 10:05:13 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/transportation/spruce_boat": {
+    "criteria": {
+      "in_water": "2025-11-30 10:05:13 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/transportation/birch_boat": {
+    "criteria": {
+      "in_water": "2025-11-30 10:05:13 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/transportation/oak_boat": {
+    "criteria": {
+      "in_water": "2025-11-30 10:05:13 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/transportation/mangrove_boat": {
+    "criteria": {
+      "in_water": "2025-11-30 10:05:13 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/food/cooked_porkchop": {
+    "criteria": {
+      "has_porkchop": "2025-11-30 10:06:57 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/transportation/acacia_boat": {
+    "criteria": {
+      "in_water": "2025-11-30 10:05:13 +0100"
+    },
+    "done": true
+  },
+  "minecraft:adventure/root": {
+    "criteria": {
+      "killed_something": "2025-11-30 10:06:33 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/food/cooked_porkchop_from_smoking": {
+    "criteria": {
+      "has_porkchop": "2025-11-30 10:06:57 +0100"
+    },
+    "done": true
+  },
+  "minecraft:adventure/kill_a_mob": {
+    "criteria": {
+      "minecraft:zombie": "2025-11-30 10:06:33 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/transportation/pale_oak_boat": {
+    "criteria": {
+      "in_water": "2025-11-30 10:05:13 +0100"
+    },
+    "done": true
+  },
+  "minecraft:adventure/adventuring_time": {
+    "criteria": {
+      "minecraft:old_growth_birch_forest": "2025-11-30 10:03:58 +0100",
+      "minecraft:forest": "2025-11-30 10:04:40 +0100",
+      "minecraft:taiga": "2025-11-30 09:32:29 +0100",
+      "minecraft:deep_dark": "2025-11-30 10:05:12 +0100",
+      "minecraft:river": "2025-11-30 10:09:03 +0100",
+      "minecraft:grove": "2025-11-30 09:32:32 +0100",
+      "minecraft:meadow": "2025-11-30 09:32:44 +0100",
+      "minecraft:birch_forest": "2025-11-30 10:05:33 +0100",
+      "minecraft:frozen_peaks": "2025-11-30 09:32:55 +0100"
+    },
+    "done": false
+  },
+  "minecraft:recipes/transportation/jungle_boat": {
+    "criteria": {
+      "in_water": "2025-11-30 10:05:13 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/transportation/dark_oak_boat": {
+    "criteria": {
+      "in_water": "2025-11-30 10:05:13 +0100"
+    },
+    "done": true
+  },
+  "DataVersion": 4556
+}

level/anvil/testdata/securechattestworld/advancements/f5f41e22-8c18-4d7e-b8f5-48f82f9e3d70.json

@@ -0,0 +1,220 @@
+{
+  "minecraft:recipes/building_blocks/polished_deepslate": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_tile_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_brick_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/combat/stone_sword": {
+    "criteria": {
+      "has_cobblestone": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/tools/stone_axe": {
+    "criteria": {
+      "has_cobblestone": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:story/mine_stone": {
+    "criteria": {
+      "get_stone": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/furnace": {
+    "criteria": {
+      "has_cobblestone": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/chiseled_deepslate_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/crafting_table": {
+    "criteria": {
+      "unlock_right_away": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_slab": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/cobbled_deepslate_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/food/cooked_porkchop_from_campfire_cooking": {
+    "criteria": {
+      "has_porkchop": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/cobbled_deepslate_wall": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/polished_deepslate_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/polished_deepslate_stairs_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/deepslate_brick_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/polished_deepslate_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/polished_deepslate_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/food/cooked_porkchop": {
+    "criteria": {
+      "has_porkchop": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/tools/stone_pickaxe": {
+    "criteria": {
+      "has_cobblestone": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_brick_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/deepslate_tile_slab_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/misc/charcoal": {
+    "criteria": {
+      "has_log": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/cobbled_deepslate_stairs": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/combat/stone_spear": {
+    "criteria": {
+      "has_cobblestone": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/decorations/deepslate_tile_wall_from_cobbled_deepslate_stonecutting": {
+    "criteria": {
+      "has_cobbled_deepslate": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
+  "minecraft:recipes/building_blocks/oak_planks": {
+    "criteria": {
+      "has_logs": "2026-03-12 21:17:28 +0100"
+    },
+    "done": true
+  },
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+    },
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+  },
+  "DataVersion": 4671
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