Add InitGameConnection codec

Signed-off-by: Graham <gpe@openrs2.org>

protocol/src/main/kotlin/org/openrs2/protocol/Protocol.kt

@@ -2,6 +2,7 @@ package org.openrs2.protocol
 
 import org.openrs2.protocol.login.ClientOutOfDateCodec
 import org.openrs2.protocol.login.InitCrossDomainConnectionCodec
+import org.openrs2.protocol.login.InitGameConnectionCodec
 import org.openrs2.protocol.login.InitJaggrabConnectionCodec
 import org.openrs2.protocol.login.InitJs5RemoteConnectionCodec
 import org.openrs2.protocol.login.IpLimitCodec
@@ -32,6 +33,7 @@ public class Protocol(vararg codecs: PacketCodec<*>) {
 
     public companion object {
         public val LOGIN_UPSTREAM: Protocol = Protocol(
+            InitGameConnectionCodec,
             InitJs5RemoteConnectionCodec,
             InitJaggrabConnectionCodec,
             RequestWorldListCodec,

protocol/src/main/kotlin/org/openrs2/protocol/login/InitGameConnectionCodec.kt

@@ -0,0 +1,20 @@
+package org.openrs2.protocol.login
+
+import io.netty.buffer.ByteBuf
+import org.openrs2.crypto.StreamCipher
+import org.openrs2.protocol.PacketCodec
+
+public object InitGameConnectionCodec : PacketCodec<LoginRequest.InitGameConnection>(
+    opcode = 14,
+    length = 1,
+    type = LoginRequest.InitGameConnection::class.java
+) {
+    override fun decode(input: ByteBuf, cipher: StreamCipher): LoginRequest.InitGameConnection {
+        val usernameHash = input.readUnsignedByte().toInt()
+        return LoginRequest.InitGameConnection(usernameHash)
+    }
+
+    override fun encode(input: LoginRequest.InitGameConnection, output: ByteBuf, cipher: StreamCipher) {
+        output.writeByte(input.usernameHash)
+    }
+}

protocol/src/main/kotlin/org/openrs2/protocol/login/LoginRequest.kt

@@ -3,6 +3,7 @@ package org.openrs2.protocol.login
 import org.openrs2.protocol.Packet
 
 public sealed class LoginRequest : Packet {
+    public data class InitGameConnection(public val usernameHash: Int) : LoginRequest()
     public data class InitJs5RemoteConnection(public val build: Int) : LoginRequest()
     public object InitJaggrabConnection : LoginRequest()
     public data class RequestWorldList(public val checksum: Int) : LoginRequest()