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/*
* 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.restcomm.protocols.ss7.sccp.impl.message;
import org.restcomm.protocols.ss7.sccp.message.SccpConnMessage;
import org.restcomm.protocols.ss7.sccp.parameter.LocalReference;
/**
* @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;
}
public static int calculateCrFieldsLengthWithoutData(int calledPartyLen, boolean creditPresence, int callingPartyLen,
boolean hopCounterPresence, boolean importancePresence) {
// 11 = 8 (fixed fields length) + 2 (pointers) + 1 (variable field length)
int res = 11;
if (calledPartyLen > 0 || creditPresence || callingPartyLen > 0 || hopCounterPresence || importancePresence)
res++; // optional part present - adding End of optional parameters
if (calledPartyLen > 0) {
// + field type octet, length octet
res += calledPartyLen + 2;
}
if (creditPresence)
res += 3;
if (callingPartyLen > 0) {
// + field type octet, length octet
res += callingPartyLen + 2;
}
if (hopCounterPresence) {
res += 3;
}
if (importancePresence) {
res += 3;
}
return res;
}
public static int calculateCcFieldsLengthWithoutData(boolean creditPresence, int calledPartyLen, boolean dataPresence,
boolean importancePresence) {
// 12 = 11 (fixed fields length) + 1 (pointers)
int res = 12;
if (creditPresence || calledPartyLen != 0 || dataPresence || importancePresence)
res++; // optional part present - adding End of optional parameters
if (creditPresence)
res += 3;
// when it's 0 it will be ignored
res += calledPartyLen + 2; // + type field, length
if (dataPresence)
res += 2; // field type, length
if (importancePresence)
res += 3;
return res;
}
public static int calculateCrefFieldsLengthWithoutData(int calledPartyAddressLen, boolean importancePresence) {
// 6 = 5 (fixed fields length) + 1 (pointers)
int res = 6;
if (calledPartyAddressLen != 0 || importancePresence)
res++; // optional part present - adding End of optional parameters
// when it's 0 it will be ignored
res += calledPartyAddressLen + 2; // + type field, length
if (importancePresence)
res += 3;
return res;
}
public static int calculateRlsdFieldsLengthWithoutData(boolean dataPresence, boolean importancePresence) {
// 9 = 8 (fixed fields length) + 1 (pointers)
int res = 9;
if (dataPresence || importancePresence)
res++; // optional part present - adding End of optional parameters
if (dataPresence)
res += 2; // type field, field length
if (importancePresence)
res += 3;
return res;
}
public static LocalReference getSln(SccpConnMessage msg) {
LocalReference sln;
if (msg instanceof SccpConnReferencedMessageImpl) {
sln = ((SccpConnReferencedMessageImpl)msg).getSourceLocalReferenceNumber();
} else if (msg instanceof SccpConnCrMessageImpl) {
sln = ((SccpConnCrMessageImpl) msg).getSourceLocalReferenceNumber();
} else {
throw new IllegalStateException("Not implemented");
}
return sln;
}
public static LocalReference getDln(SccpConnMessage msg) {
LocalReference dln;
if (msg instanceof SccpConnReferencedMessageImpl) {
dln = ((SccpConnReferencedMessageImpl)msg).getDestinationLocalReferenceNumber();
} else {
throw new IllegalStateException("Not implemented");
}
return dln;
}
}
