| /* |
| * 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 org.apache.harmony.security.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 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; |
| } |
| |
| // |
| // |
| // Decode |
| // |
| // |
| |
| 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. |
| * |
| * @param in - 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; |
| } |
| |
| // |
| // |
| // Encode |
| // |
| // |
| |
| public void encodeContent(BerOutputStream out) { |
| out.encodeInteger(); |
| } |
| |
| public void setEncodingContent(BerOutputStream out) { |
| out.length = ((byte[]) out.content).length; |
| } |
| |
| // BEGIN android-changed |
| /** |
| * 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();//FIXME optimize |
| } |
| |
| /** |
| * 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);//FIXME optimize |
| } |
| // END android-changed |
| |
| /** |
| * 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) { |
| //FIXME optimize |
| return BigInteger.valueOf(value).toByteArray(); |
| } |
| } |