PKHeX/PKHeX.Core/Saves/Substructures/Mail/Mail.cs

namespace PKHeX.Core
{
    public abstract class Mail
    {
        protected byte[] Data;
        protected int DataOffset;
        public void CopyTo(SaveFile sav) => sav.SetData(Data, DataOffset);
        public virtual void CopyTo(PK4 pk4) { }
        public virtual void CopyTo(PK5 pk5) { }
        public virtual string GetMessage(bool isLastLine) => null;
        public virtual ushort GetMessage(int index1, int index2) => 0;
        public virtual void SetMessage(string line1, string line2) { }
        public virtual void SetMessage(int index1, int index2, ushort value) { }
        public virtual string AuthorName { get; set; }
        public virtual ushort AuthorTID { get; set; }
        public virtual byte AuthorGender { get; set; }
        public virtual int AppearPKM { get; set; }
        public virtual int MailType { get; set; }
        public abstract bool? IsEmpty { get; } // true: empty, false: legal mail, null: illegal mail
        public virtual void SetBlank() { }
    }
}