/*
 * TeleStax, Open Source Cloud Communications
 * Copyright 2011-2013, Telestax Inc and individual contributors
 * by the @authors tag.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.mobicents.protocols.ss7.sccp.impl.message;

/**
 * @author baranowb
 *
 */
public class MessageUtil {

    private MessageUtil() {
        // TODO Auto-generated constructor stub
    }



    public static int calculateUdtFieldsLengthWithoutData(int calledPartyLen, int callingPartyLen) {
        // 8 = 2 (fixed fields length) + 3 (variable fields pointers) + 3
        // (variable fields lengths)
        return 8 + calledPartyLen + callingPartyLen;
    }

    public static int calculateXudtFieldsLengthWithoutData(int calledPartyLen, int callingPartyLen, boolean segmented,
            boolean importancePresense) {
        // 10 = 3 (fixed fields length) + 4 (variable fields pointers) + 3
        // (variable fields lengths)
        int res = 10 + calledPartyLen + callingPartyLen;
        if (segmented || importancePresense)
            res++; // optional part present - adding End of optional parameters
        if (segmented)
            res += 6;
        if (importancePresense)
            res += 3;

        return res;
    }

    public static int calculateXudtFieldsLengthWithoutData2(int calledPartyLen, int callingPartyLen) {
        int res = 254 - (3 + calledPartyLen + callingPartyLen);
        return res;
    }

    public static int calculateLudtFieldsLengthWithoutData(int calledPartyLen, int callingPartyLen, boolean segmented,
            boolean importancePresense) {
        // 15 = 3 (fixed fields length) + 8 (variable fields pointers) + 4 (variable fields lengths)
        int res = 15 + calledPartyLen + callingPartyLen;
        if (segmented || importancePresense)
            res++; // optional part present - adding End of optional parameters
        if (segmented)
            res += 6;
        if (importancePresense)
            res += 3;

        return res;
    }
}