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SNMPOctetString.java

/*
 * SNMP Package
 *
 * Copyright (C) 2002, Jonathan Sevy <jsevy@mcs.drexel.edu>
 *
 * This is free software. 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 name of the author may not be used to endorse or promote products 
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 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 AUTHOR 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.
 *
 */


package snmp;

import java.util.*;
import java.io.*;


/**
*     Class representing a general string of octets.
*/

public class SNMPOctetString extends SNMPObject
{
      protected byte[] data;
      protected byte tag = SNMPBERCodec.SNMPOCTETSTRING;
            
      
      /**
      *     Create a zero-length octet string.
      */
      
00051       public SNMPOctetString()
      {
            data = new byte[0];
      }
      
      
      /**
      *     Create an octet string from the bytes of the supplied String.
      */
      
00061       public SNMPOctetString(String stringData)
      {
            this.data = stringData.getBytes();
      }
      
      
      
      
      /**
      *     Create an octet string from the supplied byte array. The array may be either
      *     user-supplied, or part of a retrieved BER encoding. Note that the BER encoding
      *     of the data of an octet string is just the raw bytes.
      */
      
00075       public SNMPOctetString(byte[] enc)
      {
            extractFromBEREncoding(enc);
      }
      
      
      
      
      /**
      *     Return the array of raw bytes.
      */
      
00087       public Object getValue()
      {
            return data;
      }
      
      
      
      
      /** 
      *     Used to set the value from a byte array.
      *     @throws SNMPBadValueException Indicates an incorrect object type supplied.
      */
      
00100       public void setValue(Object data)
            throws SNMPBadValueException
      {
            if (data instanceof byte[])
                  this.data = (byte[])data;
            else if (data instanceof String)
                  this.data = ((String)data).getBytes();
            else
                  throw new SNMPBadValueException(" Octet String: bad object supplied to set value ");
      }
      
      
      
      
      
      /** 
      *     Returns the BER encoding for the octet string. Note the the "value" part of the
      *     BER type,length,value triple is just the sequence of raw bytes.
      */
      
00120       protected byte[] getBEREncoding()
      {
            
            ByteArrayOutputStream outBytes = new ByteArrayOutputStream();
            
            // calculate encoding for length of data
            byte[] len = SNMPBERCodec.encodeLength(data.length);
            
            // encode T,L,V info
            outBytes.write(tag);
            outBytes.write(len, 0, len.length);
            outBytes.write(data, 0, data.length);
      
            return outBytes.toByteArray();
      }
      
      
      
      
      protected void extractFromBEREncoding(byte[] enc)
      {
            data = new byte[enc.length];
            
            // copy data
            for (int i = 0; i < enc.length; i++)
            {
                  data[i] = enc[i];
            }
      }
      
      
      
      
      
      /** 
      *     Returns a String constructed from the raw bytes. If the bytes contain non-printable
      *     ASCII characters, tant pis! (Though it's fun when the bell rings!)
      */
      
00159       public String toString()
      {
            String returnString;
            
            /*
            if ((data.length == 4) || (data.length == 6))
            {
                  returnString = new String();
            
                  int convert = data[0];
                  if (convert < 0)
                              convert += 256;
                        returnString += convert;
                              
                  for (int i = 1; i < data.length; i++)
                  {
                        convert = data[i];
                        if (convert < 0)
                              convert += 256;
                        returnString += "." + convert;
                  }
            }
            else
                  returnString = new String(data);
            */
            
            /*
            byte[] converted = new byte[data.length];
            
            for (int i = 0; i < data.length; i++)
            {
                  if (data[i] == 0)
                        converted[i] = 0x20;    // space character
                  else
                        converted[i] = data[i];
            }
            
            returnString = new String(converted);
            */
            
            returnString = new String(data);
            
            return returnString;
            
      }
      
      
      
      private String hexByte(byte b)
      {
            int pos = b;
            if (pos < 0)
                  pos += 256;
            String returnString = new String();
            returnString += Integer.toHexString(pos/16);
            returnString += Integer.toHexString(pos%16);
            return returnString;
      }
      
      
      
      /** 
      *     Returns a space-separated hex string corresponding to the raw bytes.
      */
      
00224       public String toHexString()
      {
            String returnString = new String();
            
            
            for (int i = 0; i < data.length; i++)
            {
                  returnString += hexByte(data[i]) + " ";
            }
            
            return returnString;
            
      }
      
      
      
}

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