79 lines
2.8 KiB
Java
79 lines
2.8 KiB
Java
/*
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j8583 A Java implementation of the ISO8583 protocol
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Copyright (C) 2011 Enrique Zamudio Lopez
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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package com.solab.iso8583.parse;
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import java.math.BigInteger;
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import java.text.ParseException;
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import com.solab.iso8583.CustomField;
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import com.solab.iso8583.IsoType;
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import com.solab.iso8583.IsoValue;
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/** This class is used to parse NUMERIC fields.
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*
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* @author Enrique Zamudio
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*/
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public class NumericParseInfo extends AlphaNumericFieldParseInfo {
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public NumericParseInfo(int len) {
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super(IsoType.NUMERIC, len);
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}
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public IsoValue<Number> parseBinary(final int field, final byte[] buf,
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final int pos, final CustomField<?> custom)
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throws ParseException {
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if (pos < 0) {
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throw new ParseException(String.format("Invalid bin NUMERIC field %d pos %d",
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field, pos), pos);
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} else if (pos+(length/2) > buf.length) {
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throw new ParseException(String.format(
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"Insufficient data for bin %s field %d of length %d, pos %d",
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type, field, length, pos), pos);
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}
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//A long covers up to 18 digits
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if (length < 19) {
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long l = 0;
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long power = 1L;
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for (int i = pos + (length / 2) + (length % 2) - 1; i >= pos; i--) {
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l += (buf[i] & 0x0f) * power;
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power *= 10L;
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l += ((buf[i] & 0xf0) >> 4) * power;
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power *= 10L;
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}
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return new IsoValue<Number>(IsoType.NUMERIC, l, length, null);
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} else {
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//Use a BigInteger
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char[] digits = new char[length];
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int start = 0;
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try {
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for (int i = pos; i < pos + (length / 2) + (length % 2); i++) {
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digits[start++] = (char)(((buf[i] & 0xf0) >> 4) + 48);
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digits[start++] = (char)((buf[i] & 0x0f) + 48);
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}
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} catch (IndexOutOfBoundsException ex) {
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throw new ParseException(String.format(
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"Insufficient data for bin %s field %d of length %d, pos %d",
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type, field, length, pos), pos);
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}
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return new IsoValue<Number>(IsoType.NUMERIC, new BigInteger(new String(digits)), length, null);
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}
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}
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}
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