wwdpublic/Content.Shared/Mapping/MappingFavoritesSaveMessage.cs

using System.IO;
using Lidgren.Network;
using Robust.Shared.Network;
using Robust.Shared.Serialization;
using Robust.Shared.Utility;

namespace Content.Shared.Mapping;

public sealed class MappingFavoritesSaveMessage : NetMessage
{
    public override MsgGroups MsgGroup => MsgGroups.Command;
    public override NetDeliveryMethod DeliveryMethod => NetDeliveryMethod.ReliableUnordered;

    public List<string> PrototypeIDs = default!;

    public override void ReadFromBuffer(NetIncomingMessage buffer, IRobustSerializer serializer)
    {
        var length = buffer.ReadVariableInt32();
        using var stream = new MemoryStream(length);
        buffer.ReadAlignedMemory(stream, length);
        serializer.DeserializeDirect(stream, out PrototypeIDs);
    }

    public override void WriteToBuffer(NetOutgoingMessage buffer, IRobustSerializer serializer)
    {
        var stream = new MemoryStream();
        serializer.SerializeDirect(stream, PrototypeIDs);
        buffer.WriteVariableInt32((int) stream.Length);
        buffer.Write(stream.AsSpan());
    }
}