ife_llchar.java

pos机交易实现源代码 含金融卡交易8583协议实现 开发环境：linux 典型应用：嵌入系统开发 仅供参考

/*
 * 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 
 *    [e-mail].
 *
 * 5. Products derived from this software may not be called "jPOS",
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * 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;
import java.io.InputStream;
import java.io.IOException;

/**
 * <pre>
 * EBCDIC version of IF_LLCHAR
 * Uses a 2 EBCDIC byte length field
 * </pre>
 * @author [e-mail]
 * @version $Id: IFE_LLCHAR.java,v 1.4 2002/08/06 14:26:30 apr Exp $
 * @see ISOFieldPackager
 * @see ISOComponent
 */
public class IFE_LLCHAR extends ISOFieldPackager 
{
    public IFE_LLCHAR()
    {
	super();
    }
    /**
    * @param len - field len
    * @param description symbolic descrption
    */
    public IFE_LLCHAR(int len, String description) 
    {
	super(len, description);
    }
    /**
    * @param c - a component
    * @return packed component
    * @exception ISOException
    */
    public byte[] pack (ISOComponent c) throws ISOException 
    {
    	int len;
	String s = (String) c.getValue();
	if ((len=s.length()) > getLength() || len>99)   // paranoia settings
            throw new ISOException (
                "invalid len "+len +" packing LLECHAR field "+(Integer) c.getKey());

	String l = ISOUtil.zeropad (Integer.toString(len), 2);

	return ISOUtil.asciiToEbcdic(l + s);
    }
    /**
    * @param c - the Component to unpack
    * @param b - binary image
    * @param offset - starting offset within the binary image
    * @return consumed bytes
    * @exception ISOException
    */
    public int unpack (ISOComponent c, byte[] b, int offset)
	throws ISOException
    {
        int len = Integer.parseInt (ISOUtil.ebcdicToAscii(b, offset, 2));
	c.setValue(ISOUtil.ebcdicToAscii(b, offset+2, len));
	return len+2;
    }
    public int getMaxPackedLength() 
    {
	return getLength()+2;
    }

    public void unpack (ISOComponent c, InputStream in) 
        throws IOException, ISOException
    {
        int len = Integer.parseInt (ISOUtil.ebcdicToAscii(readBytes (in, 2)));
	c.setValue(ISOUtil.ebcdicToAscii(readBytes (in, len)));
    }
}