Something

struct packet {
    int ID; 
    int start; 
    int end;
    int done; // bool
    packet() {
        ID = start = end = -1; 
        done = 0; 
    }
    void set(int msgID, int byteStart, int byteEnd) {
        ID = msgID; 
        start = byteStart; 
        end = byteEnd; 
    }
};