Add initial login codecs required to negotiate a JS5 connection

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

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

@@ -0,0 +1,8 @@
+package org.openrs2.protocol.login
+
+import org.openrs2.protocol.EmptyPacketCodec
+
+public object ClientOutOfDateCodec : EmptyPacketCodec<LoginResponse.ClientOutOfDate>(
+    packet = LoginResponse.ClientOutOfDate,
+    opcode = 6
+)

protocol/src/main/kotlin/org/openrs2/protocol/login/InitJs5RemoteConnectionCodec.kt

@@ -0,0 +1,19 @@
+package org.openrs2.protocol.login
+
+import io.netty.buffer.ByteBuf
+import org.openrs2.protocol.PacketCodec
+
+public object InitJs5RemoteConnectionCodec : PacketCodec<LoginRequest.InitJs5RemoteConnection>(
+    type = LoginRequest.InitJs5RemoteConnection::class.java,
+    opcode = 15,
+    length = 4
+) {
+    override fun decode(input: ByteBuf): LoginRequest.InitJs5RemoteConnection {
+        val version = input.readInt()
+        return LoginRequest.InitJs5RemoteConnection(version)
+    }
+
+    override fun encode(input: LoginRequest.InitJs5RemoteConnection, output: ByteBuf) {
+        output.writeInt(input.version)
+    }
+}

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

@@ -0,0 +1,8 @@
+package org.openrs2.protocol.login
+
+import org.openrs2.protocol.EmptyPacketCodec
+
+public object IpLimitCodec : EmptyPacketCodec<LoginResponse.IpLimit>(
+    packet = LoginResponse.IpLimit,
+    opcode = 9
+)

protocol/src/main/kotlin/org/openrs2/protocol/login/Js5OkCodec.kt

@@ -0,0 +1,8 @@
+package org.openrs2.protocol.login
+
+import org.openrs2.protocol.EmptyPacketCodec
+
+public object Js5OkCodec : EmptyPacketCodec<LoginResponse.Js5Ok>(
+    packet = LoginResponse.Js5Ok,
+    opcode = 0
+)

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

@@ -0,0 +1,7 @@
+package org.openrs2.protocol.login
+
+import org.openrs2.protocol.Packet
+
+public sealed class LoginRequest : Packet {
+    public class InitJs5RemoteConnection(public val version: Int) : LoginRequest()
+}

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

@@ -0,0 +1,10 @@
+package org.openrs2.protocol.login
+
+import org.openrs2.protocol.Packet
+
+public sealed class LoginResponse : Packet {
+    public object Js5Ok : LoginResponse()
+    public object ClientOutOfDate : LoginResponse()
+    public object ServerFull : LoginResponse()
+    public object IpLimit : LoginResponse()
+}

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

@@ -0,0 +1,8 @@
+package org.openrs2.protocol.login
+
+import org.openrs2.protocol.EmptyPacketCodec
+
+public object ServerFullCodec : EmptyPacketCodec<LoginResponse.ServerFull>(
+    packet = LoginResponse.ServerFull,
+    opcode = 7
+)