From 199c1628b189d04cfc658ddb4eefca905057e7dc Mon Sep 17 00:00:00 2001
From: Doge <cooldogedev@gmail.com>
Date: Thu, 6 Feb 2025 05:10:47 +0300
Subject: [PATCH 1/2] protocol.go: override server packets (#3)

---
 legacyver/protocol.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/legacyver/protocol.go b/legacyver/protocol.go
index 98fae62..d1fd5fc 100644
--- a/legacyver/protocol.go
+++ b/legacyver/protocol.go
@@ -20,6 +20,10 @@ func init() {
 	for pkId, cur := range packetPoolClient {
 		packetPoolClient[pkId] = convertPacketFunc(pkId, cur)
 	}
+
+	for pkId, cur := range packetPoolServer {
+		packetPoolServer[pkId] = convertPacketFunc(pkId, cur)
+	}
 }
 
 func convertPacketFunc(pid uint32, cur func() packet.Packet) func() packet.Packet {

From 2672b73e4a7373e603ded20d4c31023e75d1b6cb Mon Sep 17 00:00:00 2001
From: Doge <cooldogedev@gmail.com>
Date: Thu, 6 Feb 2025 07:24:49 +0300
Subject: [PATCH 2/2] mapping: fixed custom item conversion (#4)

---
 legacyver/item_translator.go |  4 ++--
 mapping/item.go              | 10 ++++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/legacyver/item_translator.go b/legacyver/item_translator.go
index a77a880..03aef62 100644
--- a/legacyver/item_translator.go
+++ b/legacyver/item_translator.go
@@ -498,7 +498,7 @@ func (t *DefaultItemTranslator) DowngradeItemPackets(pks []packet.Packet, _ *min
 						panic(itemType)
 					}
 				} else {
-					t.latest.RegisterEntry(entry.Name)
+					t.latest.RegisterEntryRID(entry.Name, int32(entry.RuntimeID))
 					entry.RuntimeID = int16(t.mapping.RegisterEntry(entry.Name))
 				}
 				pk.Items[i] = entry
@@ -717,7 +717,7 @@ func (t *DefaultItemTranslator) UpgradeItemPackets(pks []packet.Packet, _ *minec
 						panic(itemType)
 					}
 				} else {
-					t.latest.RegisterEntry(entry.Name)
+					t.latest.RegisterEntryRID(entry.Name, int32(entry.RuntimeID))
 					entry.RuntimeID = int16(t.mapping.RegisterEntry(entry.Name))
 				}
 				pk.Items[i] = entry
diff --git a/mapping/item.go b/mapping/item.go
index e3babde..4ec7d86 100644
--- a/mapping/item.go
+++ b/mapping/item.go
@@ -12,6 +12,7 @@ type Item interface {
 	// ItemNameToRuntimeID converts a string ID to an item runtime ID.
 	ItemNameToRuntimeID(string) (int32, bool)
 	RegisterEntry(string) int32
+	RegisterEntryRID(string, int32)
 	Air() int32
 	ItemVersion() uint16
 }
@@ -96,6 +97,15 @@ func (m *DefaultItemMapping) RegisterEntry(name string) int32 {
 	return nextRID
 }
 
+func (m *DefaultItemMapping) RegisterEntryRID(name string, rid int32) {
+	defer m.mu.Unlock()
+	m.mu.Lock()
+	if _, ok := m.itemNamesToRuntimeIDs[name]; !ok {
+		m.itemNamesToRuntimeIDs[name] = rid
+		m.itemRuntimeIDsToNames[rid] = name
+	}
+}
+
 func (m *DefaultItemMapping) Air() int32 {
 	defer m.mu.Unlock()
 	m.mu.Lock()