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      1 /*
      2  *  Licensed to the Apache Software Foundation (ASF) under one or more
      3  *  contributor license agreements.  See the NOTICE file distributed with
      4  *  this work for additional information regarding copyright ownership.
      5  *  The ASF licenses this file to You under the Apache License, Version 2.0
      6  *  (the "License"); you may not use this file except in compliance with
      7  *  the License.  You may obtain a copy of the License at
      8  *
      9  *     http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  *  Unless required by applicable law or agreed to in writing, software
     12  *  distributed under the License is distributed on an "AS IS" BASIS,
     13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  *  See the License for the specific language governing permissions and
     15  *  limitations under the License.
     16  */
     17 
     18 /**
     19 * @author Vladimir N. Molotkov, Stepan M. Mishura
     20 * @version $Revision$
     21 */
     22 
     23 package org.apache.harmony.security.asn1;
     24 
     25 import java.io.IOException;
     26 import java.util.Arrays;
     27 
     28 
     29 /**
     30  * This class represents ASN.1 octet string type.
     31  *
     32  * @see <a href="http://asn1.elibel.tm.fr/en/standards/index.htm">ASN.1</a>
     33  */
     34 public class ASN1OctetString extends ASN1StringType {
     35 
     36     /** default implementation */
     37     private static final ASN1OctetString ASN1 = new ASN1OctetString();
     38 
     39     /**
     40      * Constructs ASN.1 octet string type
     41      *
     42      * The constructor is provided for inheritance purposes
     43      * when there is a need to create a custom ASN.1 octet string type.
     44      * To get a default implementation it is recommended to use
     45      * getInstance() method.
     46      */
     47     public ASN1OctetString() {
     48         super(TAG_OCTETSTRING);
     49     }
     50 
     51     /**
     52      * Returns ASN.1 octet string type default implementation
     53      *
     54      * The default implementation works with encoding
     55      * that is represented as byte array.
     56      */
     57     public static ASN1OctetString getInstance() {
     58         return ASN1;
     59     }
     60 
     61     @Override public Object decode(BerInputStream in) throws IOException {
     62         in.readOctetString();
     63 
     64         if (in.isVerify) {
     65             return null;
     66         }
     67         return getDecodedObject(in);
     68     }
     69 
     70     /**
     71      * Extracts array of bytes from BER input stream.
     72      *
     73      * @return array of bytes
     74      */
     75     @Override public Object getDecodedObject(BerInputStream in) throws IOException {
     76         return Arrays.copyOfRange(in.buffer, in.contentOffset, in.contentOffset + in.length);
     77     }
     78 
     79     @Override public void encodeContent(BerOutputStream out) {
     80         out.encodeOctetString();
     81     }
     82 
     83     @Override public void setEncodingContent(BerOutputStream out) {
     84         out.length = ((byte[]) out.content).length;
     85     }
     86 }
     87