asnencoderbase.java

snmp zip 包开发snmp协议

// NAME
//      $RCSfile: AsnEncoderBase.java,v $
// DESCRIPTION
//      [given below in javadoc format]
// DELTA
//      $Revision: 3.2 $
// CREATED
//      $Date: 2006/01/17 17:43:53 $
// COPYRIGHT
//      Westhawk Ltd
// TO DO
//

/*
 * Copyright (C) 1995, 1996 by West Consulting BV
 *
 * Permission to use, copy, modify, and distribute this software
 * for any purpose and without fee is hereby granted, provided
 * that the above copyright notices appear in all copies and that
 * both the copyright notice and this permission notice appear in
 * supporting documentation.
 * This software is provided "as is" without express or implied
 * warranty.
 * author <a href="mailto:[e-mail]">Tim Panton</a>
 * original version by [e-mail] (Jordan Hargrave)
 */

/*
 * Copyright (C) 1996 - 2006 by Westhawk Ltd
 * <a href="www.westhawk.co.uk">www.westhawk.co.uk</a>
 *
 * Permission to use, copy, modify, and distribute this software
 * for any purpose and without fee is hereby granted, provided
 * that the above copyright notices appear in all copies and that
 * both the copyright notice and this permission notice appear in
 * supporting documentation.
 * This software is provided "as is" without express or implied
 * warranty.
 * author <a href="mailto:[e-mail]">Tim Panton</a>
 */

package uk.co.westhawk.snmp.stack;
import uk.co.westhawk.snmp.util.*;
import java.io.*;
import java.util.*;

/**
 * This class contains the general methods to encode a Pdu into bytes.
 * We split the original class AsnEncoder into four classes.
 *
 * @since 4_14
 * @author <a href="mailto:[e-mail]">Tim Panton</a>
 * @version $Revision: 3.2 $ $Date: 2006/01/17 17:43:53 $
 */
class AsnEncoderBase extends Object
{
    private static final String     version_id =
        "@(#)$Id: AsnEncoderBase.java,v 3.2 2006/01/17 17:43:53 birgit Exp $ Copyright Westhawk Ltd";


/**
 * Encode PDU itself packet into bytes.
 * The actual PDU encoding is the same for v1 to v3.
 * Except for Trapv1, but we are not implementing that.
 */
protected AsnObject EncodePdu(byte msg_type,
    int pduId, int errstat, int errind, Enumeration ve)
    throws IOException
{
    AsnObject asnPduObject, asnVBObject;

    // kind of request
    asnPduObject = new AsnSequence(msg_type);
    asnPduObject.add(new AsnInteger(pduId));        // reqid
    asnPduObject.add(new AsnInteger(errstat));      // errstat
    asnPduObject.add(new AsnInteger(errind));       // errindex

    // Create VarbindList sequence
    AsnObject asnVBLObject = asnPduObject.add(new AsnSequence());

    // Add variable bindings
    while (ve.hasMoreElements())
    {
        asnVBObject = asnVBLObject.add(new AsnSequence());
        varbind vb = (varbind) ve.nextElement();
        asnVBObject.add(vb.getOid());
        asnVBObject.add(vb.getValue());
    }

    return asnPduObject;
}

}