content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one or more
   *  contributor license agreements.  See the NOTICE file distributed with
   *  this work for additional information regarding copyright ownership.
   *  The ASF licenses this file to You under the Apache License, Version 2.0
   *  (the "License"); you may not use this file except in compliance with
   *  the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   */
  
  /**
  * @author Vladimir N. Molotkov, Stepan M. Mishura
  * @version $Revision$
  */
  
  package android.framework.org.apache.harmony.security_custom.asn1;
  
  import java.io.IOException;
  import java.math.BigInteger;
  
  /**
   * This class represents ASN.1 Integer type.
   *
   * @see <a href="http://asn1.elibel.tm.fr/en/standards/index.htm">ASN.1</a>
   */
  public final class ASN1Integer extends ASN1Primitive {
  
      /** default implementation */
      private static final ASN1Integer ASN1 = new ASN1Integer();
  
      /**
       * Constructs ASN.1 Integer type
       *
       * The constructor is provided for inheritance purposes
       * when there is a need to create a custom ASN.1 Integer type.
       * To get a default implementation it is recommended to use
       * getInstance() method.
       */
      public ASN1Integer() {
          super(TAG_INTEGER);
      }
  
      /**
       * Returns ASN.1 Integer type default implementation
       *
       * The default implementation works with encoding
       * that is represented as byte array in two's-complement notation.
       *
       * @return ASN.1 Integer type default implementation
       */
      public static ASN1Integer getInstance() {
          return ASN1;
      }
  
      public Object decode(BerInputStream in) throws IOException {
          in.readInteger();
  
          if (in.isVerify) {
              return null;
          }
          return getDecodedObject(in);
      }
  
      /**
       * Extracts array of bytes from BER input stream.
       *
       * @return array of bytes
       */
      public Object getDecodedObject(BerInputStream in) throws IOException {
          byte[] bytesEncoded = new byte[in.length];
          System.arraycopy(in.buffer, in.contentOffset, bytesEncoded, 0,
                  in.length);
          return bytesEncoded;
      }
  
      public void encodeContent(BerOutputStream out) {
          out.encodeInteger();
      }
  
      public void setEncodingContent(BerOutputStream out) {
          out.length = ((byte[]) out.content).length;
      }
  
      /**
       * Converts decoded ASN.1 Integer to int value.
       * If the object represents an integer value
       * larger than 32 bits, the high bits will be lost.
       *
       * @param decoded a decoded object corresponding to this type
       * @return decoded int value.
       */
      public static int toIntValue(Object decoded) {
          return new BigInteger((byte[]) decoded).intValue();
      }
  
      /**
       * Converts decoded ASN.1 Integer to a BigInteger.
       *
       * @param decoded a decoded object corresponding to this type
       * @return decoded BigInteger value.
       */
      public static BigInteger toBigIntegerValue(Object decoded) {
          return new BigInteger((byte[]) decoded);
      }
  
      /**
       * Converts primitive int value to a form most suitable for encoding.
       *
       * @param value primitive value to be encoded
       * @return object suitable for encoding
       */
      public static Object fromIntValue(int value) {
          return BigInteger.valueOf(value).toByteArray();
      }
  }
  