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Java implementation of the ISO 8583 protocol, focused on making the creation, edition and reading of ISO8583 messages as simple and flexible as possible.
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/*
j8583 A Java implementation of the ISO8583 protocol
Copyright (C) 2011 Enrique Zamudio Lopez

This library 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 3 of the License, or (at your option) any later version.

This library 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 library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
*/
package com.solab.iso8583.parse;

import java.io.UnsupportedEncodingException;
import java.text.ParseException;

import com.solab.iso8583.CustomField;
import com.solab.iso8583.IsoType;
import com.solab.iso8583.IsoValue;
import com.solab.iso8583.util.Bcd;

/**
 * This class is used to parse fields of type LLVAR.
 *
 * @author Enrique Zamudio
 */
public class LlvarParseInfo extends FieldParseInfo {

    /**
     * Instantiates a new Llvar parse info.
     *
     * @param t   the t
     * @param len the len
     */
    public LlvarParseInfo(IsoType t, int len) {
		super(t, len);
	}

    /**
     * Instantiates a new Llvar parse info.
     */
    public LlvarParseInfo() {
		super(IsoType.LLVAR, 0);
	}

    @Override
	public  IsoValue parse(final int field, final byte[] buf,
                             final int pos, final CustomField custom)
			throws ParseException, UnsupportedEncodingException {
		if (pos < 0) {
			throw new ParseException(String.format(
					"Invalid LLVAR field %d %d", field, pos), pos);
		} else if (pos+2 > buf.length) {
			throw new ParseException(String.format(
					"Insufficient data for LLVAR header, pos %d", pos), pos);
		}
		final int len = decodeLength(buf, pos, 2);
		if (len < 0) {
			throw new ParseException(String.format(
                    "Invalid LLVAR length %d, field %d pos %d", len, field, pos), pos);
		} else if (len+pos+2 > buf.length) {
			throw new ParseException(String.format(
                    "Insufficient data for LLVAR field %d, pos %d len %d",
                    field, pos, len), pos);
		}
		String _v;
        try {
            _v = len == 0 ? "" : new String(buf, pos + 2, len, getCharacterEncoding());
        } catch (IndexOutOfBoundsException ex) {
            throw new ParseException(String.format(
                    "Insufficient data for LLVAR header, field %d pos %d len %d",
                    field, pos, len), pos);
        }
		//This is new: if the String's length is different from the specified
		// length in the buffer, there are probably some extended characters.
		// So we create a String from the rest of the buffer, and then cut it to
		// the specified length.
		if (_v.length() != len) {
			_v = new String(buf, pos + 2, buf.length-pos-2,
					getCharacterEncoding()).substring(0, len);
		}
		if (custom == null) {
			return new IsoValue<>(type, _v, len, null);
		} else {
            T dec = custom.decodeField(_v);
            return dec == null ? new IsoValue<>(type, _v, len, null) :
                    new IsoValue<>(type, dec, len, custom);
		}
	}

    @Override
	public  IsoValue parseBinary(final int field, final byte[] buf,
                                   final int pos, final CustomField custom)
			throws ParseException, UnsupportedEncodingException {
		if (pos < 0) {
			throw new ParseException(String.format("Invalid bin LLVAR field %d pos %d",
                    field, pos), pos);
		} else if (pos+1 > buf.length) {
			throw new ParseException(String.format(
                    "Insufficient data for bin LLVAR header, field %d pos %d",
					field, pos), pos);
		}
		final int len = getFieldLength(buf[pos]);
		if (len < 0) {
			throw new ParseException(String.format(
                    "Invalid bin LLVAR length %d, field %d pos %d", len, field, pos), pos);
		}
		if (len+pos+1 > buf.length) {
			throw new ParseException(String.format(
                    "Insufficient data for bin LLVAR field %d, pos %d", field, pos), pos);
		}
		if (custom == null) {
			return new IsoValue<>(type, new String(buf, pos + 1, len,
					getCharacterEncoding()), null);
		} else {
            T dec = custom.decodeField(new String(buf, pos + 1, len, getCharacterEncoding()));
            return dec == null ? new IsoValue<>(type,
					new String(buf, pos + 1, len, getCharacterEncoding()), null) :
                    new IsoValue<>(type, dec, custom);
		}
	}

    /**
     * Gets field length.
     *
     * @param b the b
     * @return the field length
     */
    protected int getFieldLength(final byte b) {
		return (((b & 0xf0) >> 4) * 10) + (b & 0x0f);
	}

}