/* * Copyright (c) 2000 jPOS.org.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in *    the documentation and/or other materials provided with the *    distribution. * * 3. The end-user documentation included with the redistribution, *    if any, must include the following acknowledgment: *    "This product includes software developed by the jPOS project  *    (http://www.jpos.org/)". Alternately, this acknowledgment may  *    appear in the software itself, if and wherever such third-party  *    acknowledgments normally appear. * * 4. The names "jPOS" and "jPOS.org" must not be used to endorse  *    or promote products derived from this software without prior  *    written permission. For written permission, please contact  *    license@jpos.org. * * 5. Products derived from this software may not be called "jPOS", *    nor may "jPOS" appear in their name, without prior written *    permission of the jPOS project. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.   * IN NO EVENT SHALL THE JPOS PROJECT OR ITS CONTRIBUTORS BE LIABLE FOR  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE  * POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the jPOS Project.  For more * information please see <http://www.jpos.org/>. */package org.jpos.iso;/** * Implements Hex Interpreter. The Hex digits are stored in ASCII. *  * @author joconnor * @version $Revision: 1.2 $ $Date: 2003/11/05 09:00:53 $ */public class AsciiHexInterpreter implements BinaryInterpreter{    /** An instance of this Interpreter. Only one needed for the whole system */    public static final AsciiHexInterpreter INSTANCE = new AsciiHexInterpreter();    /** 0-15 to ASCII hex digit lookup table. */    private static final byte[] HEX_ASCII = new byte[] {              0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,              0x38, 0x39, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46    };    /**     * Converts the binary data into ASCII hex digits.     * @see org.jpos.iso.BinaryInterpreter#interpret(byte[], byte[], int)     */    public void interpret(byte[] data, byte[] b, int offset)    {        for (int i = 0; i < data.length; i++) {            b[offset + i * 2] = HEX_ASCII[(data[i] & 0xF0) >> 4];            b[offset + i * 2 + 1] = HEX_ASCII[data[i] & 0x0F];        }    }    /**     * Converts the ASCII hex digits into binary data.     * @see org.jpos.iso.BinaryInterpreter#uninterpret(byte[], int, int)     */    public byte[] uninterpret(byte[] rawData, int offset, int length)    {        byte[] ret = new byte[length];        for (int i = 0; i < length; i++)        {            byte hi = rawData[offset + i * 2];            byte lo = rawData[offset + i * 2 + 1];            int h = hi > 0x40 ? 10 + hi - 0x41 : hi - 0x30;            int l = lo > 0x40 ? 10 + lo - 0x41 : lo - 0x30;            ret[i] = (byte)(h << 4 | l);        }        return ret;    }    /**     * Returns double nBytes because the hex representation of 1 byte needs 2 hex digits.     *      * @see org.jpos.iso.BinaryInterpreter#getPackedLength(int)     */    public int getPackedLength(int nBytes)    {        return nBytes * 2;    }}