Add CreateCheckDateOfBirthCountry packet

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

@@ -13,6 +13,7 @@ import org.openrs2.protocol.login.downstream.Js5OkCodec
 import org.openrs2.protocol.login.downstream.LoginDownstream
 import org.openrs2.protocol.login.downstream.ServerFullCodec
 import org.openrs2.protocol.login.upstream.CheckWorldSuitabilityCodec
+import org.openrs2.protocol.login.upstream.CreateCheckDateOfBirthCountryCodec
 import org.openrs2.protocol.login.upstream.InitCrossDomainConnectionCodec
 import org.openrs2.protocol.login.upstream.InitGameConnectionCodec
 import org.openrs2.protocol.login.upstream.InitJaggrabConnectionCodec
@@ -32,6 +33,7 @@ public object ProtocolModule : AbstractModule() {
             InitGameConnectionCodec::class.java,
             InitJs5RemoteConnectionCodec::class.java,
             InitJaggrabConnectionCodec::class.java,
+            CreateCheckDateOfBirthCountryCodec::class.java,
             RequestWorldListCodec::class.java,
             CheckWorldSuitabilityCodec::class.java,
             InitCrossDomainConnectionCodec::class.java

protocol/src/main/kotlin/org/openrs2/protocol/login/upstream/CreateCheckDateOfBirthCountryCodec.kt

@@ -0,0 +1,30 @@
+package org.openrs2.protocol.login.upstream
+
+import io.netty.buffer.ByteBuf
+import org.openrs2.crypto.StreamCipher
+import org.openrs2.protocol.PacketCodec
+import java.time.LocalDate
+import javax.inject.Singleton
+
+@Singleton
+public class CreateCheckDateOfBirthCountryCodec : PacketCodec<LoginRequest.CreateCheckDateOfBirthCountry>(
+    type = LoginRequest.CreateCheckDateOfBirthCountry::class.java,
+    opcode = 20,
+    length = 6
+) {
+    override fun decode(input: ByteBuf, cipher: StreamCipher): LoginRequest.CreateCheckDateOfBirthCountry {
+        val day = input.readUnsignedByte().toInt()
+        val month = input.readUnsignedByte().toInt() + 1
+        val year = input.readUnsignedShort()
+        val country = input.readUnsignedShort()
+
+        return LoginRequest.CreateCheckDateOfBirthCountry(LocalDate.of(year, month, day), country)
+    }
+
+    override fun encode(input: LoginRequest.CreateCheckDateOfBirthCountry, output: ByteBuf, cipher: StreamCipher) {
+        output.writeByte(input.dateOfBirth.dayOfMonth)
+        output.writeByte(input.dateOfBirth.monthValue - 1)
+        output.writeShort(input.dateOfBirth.year)
+        output.writeShort(input.country)
+    }
+}

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

@@ -1,11 +1,16 @@
 package org.openrs2.protocol.login.upstream
 
 import org.openrs2.protocol.Packet
+import java.time.LocalDate
 
 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 CreateCheckDateOfBirthCountry(
+        public val dateOfBirth: LocalDate,
+        public val country: Int
+    ) : LoginRequest()
     public data class RequestWorldList(public val checksum: Int) : LoginRequest()
     public data class CheckWorldSuitability(
         public val build: Int,