From e1fc8a94f5cf27a3bc68ca321141d049db12bc24 Mon Sep 17 00:00:00 2001
From: ChillerDragon <ChillerDragon@gmail.com>
Date: Sat, 22 Jun 2024 13:07:47 +0800
Subject: [PATCH] Add snap empty msg

---
 messages7/snap_empty.go | 52 +++++++++++++++++++++++++++++++++++++++++
 network7/network7.go    |  1 +
 protocol7/packet.go     |  4 ++++
 3 files changed, 57 insertions(+)
 create mode 100644 messages7/snap_empty.go

diff --git a/messages7/snap_empty.go b/messages7/snap_empty.go
new file mode 100644
index 0000000..26f4bfb
--- /dev/null
+++ b/messages7/snap_empty.go
@@ -0,0 +1,52 @@
+package messages7
+
+import (
+	"slices"
+
+	"github.com/teeworlds-go/teeworlds/chunk7"
+	"github.com/teeworlds-go/teeworlds/network7"
+	"github.com/teeworlds-go/teeworlds/packer"
+)
+
+type SnapEmpty struct {
+	ChunkHeader *chunk7.ChunkHeader
+
+	GameTick  int
+	DeltaTick int
+}
+
+func (msg SnapEmpty) MsgId() int {
+	return network7.MsgSysSnapEmpty
+}
+
+func (msg SnapEmpty) MsgType() network7.MsgType {
+	return network7.TypeNet
+}
+
+func (msg SnapEmpty) System() bool {
+	return true
+}
+
+func (msg SnapEmpty) Vital() bool {
+	return false
+}
+
+func (msg SnapEmpty) Pack() []byte {
+	return slices.Concat(
+		packer.PackInt(msg.GameTick),
+		packer.PackInt(msg.DeltaTick),
+	)
+}
+
+func (msg *SnapEmpty) Unpack(u *packer.Unpacker) {
+	msg.GameTick = u.GetInt()
+	msg.DeltaTick = u.GetInt()
+}
+
+func (msg *SnapEmpty) Header() *chunk7.ChunkHeader {
+	return msg.ChunkHeader
+}
+
+func (msg *SnapEmpty) SetHeader(header *chunk7.ChunkHeader) {
+	msg.ChunkHeader = header
+}
diff --git a/network7/network7.go b/network7/network7.go
index c106ee4..58ab8d3 100644
--- a/network7/network7.go
+++ b/network7/network7.go
@@ -12,6 +12,7 @@ const (
 	MsgSysInfo       = 1
 	MsgSysMapChange  = 2
 	MsgSysConReady   = 5
+	MsgSysSnapEmpty  = 7
 	MsgSysSnapSingle = 8
 	MsgSysReady      = 18
 	MsgSysEnterGame  = 19
diff --git a/protocol7/packet.go b/protocol7/packet.go
index e15b002..4a06c39 100644
--- a/protocol7/packet.go
+++ b/protocol7/packet.go
@@ -93,6 +93,10 @@ func (packet *Packet) unpackSystem(msgId int, chunk chunk7.Chunk, u *packer.Unpa
 		msg := &messages7.SnapSingle{ChunkHeader: &chunk.Header}
 		msg.Unpack(u)
 		packet.Messages = append(packet.Messages, msg)
+	} else if msgId == network7.MsgSysSnapEmpty {
+		msg := &messages7.SnapEmpty{ChunkHeader: &chunk.Header}
+		msg.Unpack(u)
+		packet.Messages = append(packet.Messages, msg)
 	} else {
 		return false
 	}