001/*
002 * jPOS Project [http://jpos.org]
003 * Copyright (C) 2000-2026 jPOS Software SRL
004 *
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Affero General Public License as
007 * published by the Free Software Foundation, either version 3 of the
008 * License, or (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013 * GNU Affero General Public License for more details.
014 *
015 * You should have received a copy of the GNU Affero General Public License
016 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
017 */
018
019package org.jpos.iso;
020import java.io.IOException;
021import java.io.InputStream;
022
023/**
024 * Length is represented in ASCII (as in IFA_LL*)
025 * Value is represented in BCD
026 * ISOFieldPackager Binary LLNUM
027 *
028 * @author Mladen Mrkic <mmrkic@arius.co.yu>
029 *
030 * @see ISOComponent
031 */
032public class IFA_LLBNUM extends ISOFieldPackager {
033    private Interpreter interpreter;
034    private Prefixer prefixer;
035    
036    public IFA_LLBNUM () {
037        super();
038        interpreter = BCDInterpreter.LEFT_PADDED;
039        prefixer = AsciiPrefixer.LL;
040    }
041    /**
042     * @param len - field len
043     * @param description symbolic descrption
044     */
045    public  IFA_LLBNUM (int len, String description, boolean pad) {
046        super(len, description);
047        this.pad = pad;
048        interpreter = pad ? BCDInterpreter.LEFT_PADDED : BCDInterpreter.RIGHT_PADDED;
049        prefixer = AsciiPrefixer.LL;
050    }
051
052    public void setPad(boolean pad)
053    {
054        this.pad = pad;
055        interpreter = pad ? BCDInterpreter.LEFT_PADDED : BCDInterpreter.RIGHT_PADDED;
056    }
057
058    /**
059     * @param c - a component
060     * @return packed component
061     * @exception ISOException
062     */
063    public byte[] pack (ISOComponent c) throws ISOException {
064        String s = (String) c.getValue();
065        int len = s.length();
066        if (len > getLength() || len>99)   // paranoia settings
067            throw new ISOException (
068                "invalid len "+len +" packing IFA_LLBNUM field " + c.getKey()
069            );
070
071        byte[] b = new byte[2 + ((len+1) >> 1)];
072        prefixer.encodeLength(len + 1 >> 1 << 1, b);
073        interpreter.interpret(s, b, 2);
074        return b;
075    }
076
077    /**
078     * @param c - the Component to unpack
079     * @param b - binary image
080     * @param offset - starting offset within the binary image
081     * @return consumed bytes
082     * @exception ISOException
083     */
084    public int unpack (ISOComponent c, byte[] b, int offset)
085        throws ISOException
086    {
087        int len = prefixer.decodeLength(b, offset);
088        c.setValue (interpreter.uninterpret(b, offset + 2, len));
089        return 2 + (++len >> 1);
090    }
091    public void unpack (ISOComponent c, InputStream in) 
092        throws IOException, ISOException
093    {
094        int len = prefixer.decodeLength(readBytes (in, 2), 2);
095        c.setValue (interpreter.uninterpret(readBytes (in, len+2 >> 1), 0, len));
096    }
097    public int getMaxPackedLength() {
098        return 1 + (getLength()+1 >> 1);
099    }
100}