Add 1.20.70 & 1.20.60 support + Fix crafting issue (#9)

legacyver/proto/id.go

@@ -12,6 +12,8 @@ const (
 	ID686 = 686 // v1.21.2
 	ID685 = 685 // v1.21.0
 	ID671 = 671 // v1.20.80
+	ID662 = 662 // v1.20.70
+	ID649 = 649 // v1.20.60
 )
 
 func IsProtoGTE(io protocol.IO, proto int32) bool {

legacyver/proto/item_stack.go

@@ -808,9 +808,13 @@ func (a *CraftRecipeStackRequestAction) FromLatest(y *protocol.CraftRecipeStackR
 }
 
 func (a *CraftRecipeStackRequestAction) ToLatest() *protocol.CraftRecipeStackRequestAction {
+	numberOfCrafts := a.NumberOfCrafts
+	if numberOfCrafts == 0 {
+		numberOfCrafts = 1
+	}
 	return &protocol.CraftRecipeStackRequestAction{
 		RecipeNetworkID: a.RecipeNetworkID,
-		NumberOfCrafts:  a.NumberOfCrafts,
+		NumberOfCrafts:  numberOfCrafts,
 	}
 }
 

legacyver/proto/recipe.go

@@ -677,7 +677,9 @@ func marshalShaped(r protocol.IO, recipe *ShapedRecipe) {
 	r.UUID(&recipe.UUID)
 	r.String(&recipe.Block)
 	r.Varint32(&recipe.Priority)
-	r.Bool(&recipe.AssumeSymmetry)
+	if IsProtoGTE(r, ID671) {
+		r.Bool(&recipe.AssumeSymmetry)
+	}
 	if IsProtoGTE(r, ID685) {
 		protocol.Single(r, &recipe.UnlockRequirement)
 	}

legacyver/proto/resource_pack.go

@@ -132,5 +132,7 @@ func (x *BehaviourPackInfo) Marshal(r protocol.IO) {
 	r.String(&x.SubPackName)
 	r.String(&x.ContentIdentity)
 	r.Bool(&x.HasScripts)
-	r.Bool(&x.AddonPack)
+	if IsProtoGTE(r, ID712) {
+		r.Bool(&x.AddonPack)
+	}
 }