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/*
* TeleStax, Open Source Cloud Communications Copyright 2012.
* and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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.map.primitives;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import org.restcomm.protocols.ss7.map.api.MAPException;
import org.restcomm.protocols.ss7.map.api.datacoding.CBSDataCodingGroup;
import org.restcomm.protocols.ss7.map.api.datacoding.CBSDataCodingScheme;
import org.restcomm.protocols.ss7.map.api.datacoding.CBSNationalLanguage;
import org.restcomm.protocols.ss7.map.api.primitives.USSDString;
import org.restcomm.protocols.ss7.map.datacoding.CBSDataCodingSchemeImpl;
import org.restcomm.protocols.ss7.map.datacoding.GSMCharset;
import org.restcomm.protocols.ss7.map.datacoding.GSMCharsetDecoder;
import org.restcomm.protocols.ss7.map.datacoding.GSMCharsetDecodingData;
import org.restcomm.protocols.ss7.map.datacoding.GSMCharsetEncoder;
import org.restcomm.protocols.ss7.map.datacoding.GSMCharsetEncodingData;
import org.restcomm.protocols.ss7.map.datacoding.Gsm7EncodingStyle;
/**
*
* @author amit bhayani
* @author sergey vetyutnev
*
*/
public class USSDStringImpl extends OctetStringBase implements USSDString {
private CBSDataCodingScheme dataCodingScheme;
private static GSMCharset gsm7Charset = new GSMCharset("GSM", new String[] {});
private static GSMCharset gsm7Charset_Urdu = new GSMCharset("GSM", new String[] {}, GSMCharset.BYTE_TO_CHAR_UrduAlphabet,
GSMCharset.BYTE_TO_CHAR_UrduAlphabetExtentionTable);
private static Charset ucs2Charset = Charset.forName("UTF-16BE");
public USSDStringImpl(CBSDataCodingScheme dataCodingScheme) {
super(1, 160, "USSDString");
if (dataCodingScheme == null) {
dataCodingScheme = new CBSDataCodingSchemeImpl(15);
}
this.dataCodingScheme = dataCodingScheme;
}
public USSDStringImpl(byte[] data, CBSDataCodingScheme dataCodingScheme) {
super(1, 160, "USSDString", data);
if (dataCodingScheme == null) {
dataCodingScheme = new CBSDataCodingSchemeImpl(15);
}
this.dataCodingScheme = dataCodingScheme;
}
public USSDStringImpl(String ussdString, CBSDataCodingScheme dataCodingScheme, Charset gsm8Charset) throws MAPException {
super(1, 160, "USSDString");
if (ussdString == null) {
ussdString = "";
}
if (dataCodingScheme == null) {
dataCodingScheme = new CBSDataCodingSchemeImpl(15);
}
this.dataCodingScheme = dataCodingScheme;
if (dataCodingScheme.getIsCompressed()) {
// TODO: implement the case with compressed message
throw new MAPException("Error encoding a text in USSDStringImpl: compressed message is not supported yet");
} else {
switch (dataCodingScheme.getCharacterSet()) {
case GSM7:
Charset cSet = gsm7Charset;
if (dataCodingScheme.getNationalLanguageShiftTable() == CBSNationalLanguage.Arabic) {
cSet = gsm7Charset_Urdu;
}
GSMCharsetEncoder encoder = (GSMCharsetEncoder) cSet.newEncoder();
encoder.setGSMCharsetEncodingData(new GSMCharsetEncodingData(Gsm7EncodingStyle.bit7_ussd_style, null));
ByteBuffer bb = null;
try {
bb = encoder.encode(CharBuffer.wrap(ussdString));
} catch (Exception e) {
// This can not occur
}
if (bb != null) {
this.data = new byte[bb.limit()];
bb.get(this.data);
} else
this.data = new byte[0];
break;
case GSM8:
if (gsm8Charset != null) {
bb = gsm8Charset.encode(ussdString);
this.data = new byte[bb.limit()];
bb.get(this.data);
} else {
throw new MAPException(
"Error encoding a text in USSDStringImpl: gsm8Charset is not defined for GSM8 dataCodingScheme");
}
break;
case UCS2:
if (dataCodingScheme.getDataCodingGroup() == CBSDataCodingGroup.GeneralWithLanguageIndication) {
if (ussdString.length() < 1)
ussdString = ussdString + " ";
if (ussdString.length() < 2)
ussdString = ussdString + " ";
if (ussdString.length() < 3)
ussdString = ussdString + "\n";
cSet = gsm7Charset;
encoder = (GSMCharsetEncoder) cSet.newEncoder();
encoder.setGSMCharsetEncodingData(new GSMCharsetEncodingData(Gsm7EncodingStyle.bit7_ussd_style, null));
bb = null;
try {
String sb = ussdString.substring(0, 3);
bb = encoder.encode(CharBuffer.wrap(sb));
} catch (Exception e) {
// This can not occur
}
byte[] buf1;
if (bb != null) {
buf1 = new byte[bb.limit()];
bb.get(buf1);
} else
buf1 = new byte[0];
String sb2 = ussdString.substring(3);
bb = ucs2Charset.encode(sb2);
this.data = new byte[buf1.length + bb.limit()];
System.arraycopy(buf1, 0, this.data, 0, buf1.length);
bb.get(this.data, buf1.length, this.data.length - buf1.length);
} else {
bb = ucs2Charset.encode(ussdString);
this.data = new byte[bb.limit()];
bb.get(this.data);
}
break;
}
}
}
public byte[] getEncodedString() {
return this.data;
}
public String getString(Charset gsm8Charset) throws MAPException {
String res = "";
if (dataCodingScheme == null) {
dataCodingScheme = new CBSDataCodingSchemeImpl(15);
}
if (this.data == null) {
throw new MAPException("Error decoding a text in USSDStringImpl: encoded data can not be null");
}
if (dataCodingScheme.getIsCompressed()) {
// TODO: implement the case with compressed sms message
throw new MAPException("Error decoding a text in USSDStringImpl: compressed message is not supported yet");
} else {
switch (dataCodingScheme.getCharacterSet()) {
case GSM7:
GSMCharset cSet = gsm7Charset;
if (dataCodingScheme.getNationalLanguageShiftTable() == CBSNationalLanguage.Arabic) {
cSet = gsm7Charset_Urdu;
}
GSMCharsetDecoder decoder = (GSMCharsetDecoder) cSet.newDecoder();
decoder.setGSMCharsetDecodingData(new GSMCharsetDecodingData(Gsm7EncodingStyle.bit7_ussd_style,
Integer.MAX_VALUE, 0));
ByteBuffer bb = ByteBuffer.wrap(this.data);
CharBuffer bf = null;
try {
bf = decoder.decode(bb);
} catch (CharacterCodingException e) {
// This can not occur
}
if (bf != null)
res = bf.toString();
break;
case GSM8:
if (gsm8Charset != null) {
byte[] buf = this.data;
bb = ByteBuffer.wrap(buf);
bf = gsm8Charset.decode(bb);
res = bf.toString();
}
break;
case UCS2:
String pref = "";
byte[] buf = this.data;
if (dataCodingScheme.getDataCodingGroup() == CBSDataCodingGroup.GeneralWithLanguageIndication) {
cSet = gsm7Charset;
decoder = (GSMCharsetDecoder) cSet.newDecoder();
decoder.setGSMCharsetDecodingData(new GSMCharsetDecodingData(Gsm7EncodingStyle.bit7_ussd_style,
Integer.MAX_VALUE, 0));
byte[] buf2 = new byte[3];
if (this.data.length < 3)
buf2 = new byte[this.data.length];
System.arraycopy(this.data, 0, buf2, 0, buf2.length);
bb = ByteBuffer.wrap(buf2);
bf = null;
try {
bf = decoder.decode(bb);
} catch (CharacterCodingException e) {
// This can not occur
}
if (bf != null)
pref = bf.toString();
if (this.data.length <= 3) {
buf = new byte[0];
} else {
buf = new byte[this.data.length - 3];
System.arraycopy(this.data, 3, buf, 0, buf.length);
}
bb = ByteBuffer.wrap(buf);
bf = ucs2Charset.decode(bb);
res = pref + bf.toString();
} else {
bb = ByteBuffer.wrap(buf);
bf = ucs2Charset.decode(bb);
res = bf.toString();
}
break;
}
}
return res;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(_PrimitiveName);
sb.append(" [");
try {
String s1 = this.getString(null);
sb.append(s1);
} catch (MAPException e) {
}
if (this.dataCodingScheme != null) {
sb.append(", dcs=");
sb.append(dataCodingScheme);
}
sb.append("]");
return sb.toString();
}
}
