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

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

    public LlbinParseInfo(IsoType t, int len) {
        super(t, len);
    }

	public LlbinParseInfo() {
		super(IsoType.LLBIN, 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 LLBIN field %d position %d",
                    field, pos), pos);
		} else if (pos+2 > buf.length) {
			throw new ParseException(String.format("Insufficient LLBIN header field %d",
                    field), pos);
		}
		final int len = decodeLength(buf, pos, 2);
		if (len < 0) {
			throw new ParseException(String.format("Invalid LLBIN field %d length %d pos %d",
                    field, len, pos), pos);
		}
		if (len+pos+2 > buf.length) {
			throw new ParseException(String.format(
                    "Insufficient data for LLBIN field %d, pos %d (LEN states '%s')",
                    field, pos, new String(buf, pos, 2)), pos);
		}
		byte[] binval = len == 0 ? new byte[0] : HexCodec.hexDecode(
                new String(buf, pos + 2, len));
		if (custom == null) {
			return new IsoValue<>(type, binval, binval.length, null);
        } else if (custom instanceof CustomBinaryField) {
            try {
                T dec = ((CustomBinaryField)custom).decodeBinaryField(buf, pos + 2, len);
                return dec == null ? new IsoValue<>(type, binval, binval.length, null) :
                        new IsoValue<>(type, dec, 0, custom);
            } catch (IndexOutOfBoundsException ex) {
                throw new ParseException(String.format(
                        "Insufficient data for LLBIN field %d, pos %d (LEN states '%s')",
                        field, pos, new String(buf, pos, 2)), pos);
            }
		} else {
            try {
                T dec = custom.decodeField(new String(buf, pos + 2, len));
                return dec == null ? new IsoValue<>(type, binval, binval.length, null) :
                        new IsoValue<>(type, dec, binval.length, custom);
            } catch (IndexOutOfBoundsException ex) {
                throw new ParseException(String.format(
                        "Insufficient data for LLBIN field %d, pos %d (LEN states '%s')",
                        field, pos, new String(buf, pos, 2)), pos);
            }
		}
	}

	@Override
	public  IsoValue parseBinary(final int field, final byte[] buf,
                                   final int pos, final CustomField custom)
            throws ParseException {
		if (pos < 0) {
			throw new ParseException(String.format("Invalid bin LLBIN field %d position %d",
                    field, pos), pos);
		} else if (pos+1 > buf.length) {
			throw new ParseException(String.format("Insufficient bin LLBIN header field %d",
                    field), pos);
		}
		final int l = getLengthForBinaryParsing(buf[pos]);
		if (l < 0) {
			throw new ParseException(String.format("Invalid bin LLBIN length %d pos %d", l, pos), pos);
		}
		if (l+pos+1 > buf.length) {
			throw new ParseException(String.format(
                    "Insufficient data for bin LLBIN field %d, pos %d: need %d, only %d available",
                    field, pos, l, buf.length), pos);
		}
		byte[] _v = new byte[l];
		System.arraycopy(buf, pos+1, _v, 0, l);
		if (custom == null) {
            int len = getFieldLength(buf[pos]);
            return new IsoValue<>(type, _v, len, forceHexadecimalLength);
        } else if (custom instanceof CustomBinaryField) {
            try {
                T dec = ((CustomBinaryField)custom).decodeBinaryField(buf, pos + 1, l);
                return dec == null ? new IsoValue<>(type, _v, _v.length, null) :
                        new IsoValue<>(type, dec, l, custom);
            } catch (IndexOutOfBoundsException ex) {
                throw new ParseException(String.format(
                        "Insufficient data for LLBIN field %d, pos %d length %d",
                        field, pos, l), pos);
            }
		} else {
            T dec = custom.decodeField(HexCodec.hexEncode(_v, 0, _v.length));
            return dec == null ? new IsoValue<>(type, _v, null) :
                    new IsoValue<>(type, dec, custom);
		}
	}

	protected int getLengthForBinaryParsing(final byte b) {
    	return getFieldLength(b);
	}

	private int getFieldLength(final byte b) {
		return forceHexadecimalLength ?
				b
				:
				Bcd.parseBcdLength(b);
	}
}