Add support for protocol version 1.21.100 (#12)

mapping/block.go

@@ -2,9 +2,10 @@ package mapping
 
 import (
 	"bytes"
-	"github.com/akmalfairuz/legacy-version/internal"
 	"sort"
 
+	"github.com/akmalfairuz/legacy-version/internal"
+
 	"github.com/df-mc/worldupgrader/blockupgrader"
 	"github.com/sandertv/gophertunnel/minecraft/nbt"
 	"github.com/sandertv/gophertunnel/minecraft/protocol"
@@ -23,6 +24,7 @@ type Block interface {
 	// Adjust adjusts the latest mappings to account for custom states.
 	Adjust([]protocol.BlockEntry)
 	Air() uint32
+	InfoUpdate() uint32
 }
 
 type DefaultBlockMapping struct {
@@ -36,6 +38,9 @@ type DefaultBlockMapping struct {
 
 	// airRID is the runtime ID of the air block in the latest version of the game.
 	airRID uint32
+
+	// infoUpdateRID is the runtime ID of the info_update block in the latest version of the game.
+	infoUpdateBlockRID uint32
 }
 
 func NewBlockMapping(raw []byte) *DefaultBlockMapping {
@@ -45,6 +50,7 @@ func NewBlockMapping(raw []byte) *DefaultBlockMapping {
 	stateRuntimeIDs := make(map[internal.StateHash]uint32)
 	runtimeIDToState := make(map[uint32]blockupgrader.BlockState)
 	var airRID *uint32
+	var infoUpdateBlockRID *uint32
 
 	var s blockupgrader.BlockState
 	for {
@@ -54,8 +60,11 @@ func NewBlockMapping(raw []byte) *DefaultBlockMapping {
 
 		rid := uint32(len(states))
 		states = append(states, s)
-		if s.Name == "minecraft:air" {
+		switch s.Name {
+		case "minecraft:air":
 			airRID = &rid
+		case "minecraft:info_update":
+			infoUpdateBlockRID = &rid
 		}
 
 		stateRuntimeIDs[internal.HashState(blockupgrader.Upgrade(s))] = rid
@@ -64,12 +73,16 @@ func NewBlockMapping(raw []byte) *DefaultBlockMapping {
 	if airRID == nil {
 		panic("couldn't find air")
 	}
+	if infoUpdateBlockRID == nil {
+		panic("couldn't find info_update block")
+	}
 
 	return &DefaultBlockMapping{
-		states:           states,
-		stateRuntimeIDs:  stateRuntimeIDs,
-		runtimeIDToState: runtimeIDToState,
-		airRID:           *airRID,
+		states:             states,
+		stateRuntimeIDs:    stateRuntimeIDs,
+		runtimeIDToState:   runtimeIDToState,
+		airRID:             *airRID,
+		infoUpdateBlockRID: *infoUpdateBlockRID,
 	}
 }
 
@@ -134,3 +147,7 @@ func (m *DefaultBlockMapping) Adjust(entries []protocol.BlockEntry) {
 func (m *DefaultBlockMapping) Air() uint32 {
 	return m.airRID
 }
+
+func (m *DefaultBlockMapping) InfoUpdate() uint32 {
+	return m.infoUpdateBlockRID
+}