internal T PromoteHeader <T>(MarkingBinaryReader reader) where T : RarHeader, new() { T header = new T(); header.FillBase(this); reader.Mark(); header.ReadFromReader(reader); header.ReadBytes += reader.CurrentReadByteCount; int headerSizeDiff = header.HeaderSize - (int)header.ReadBytes; if (headerSizeDiff > 0) { reader.ReadBytes(headerSizeDiff); } return(header); }