| /* GeneralSubtree.java -- |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is a part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or (at |
| your option) any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 |
| USA |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.security.x509.ext; |
| |
| import gnu.java.security.der.DERReader; |
| import gnu.java.security.der.DERValue; |
| |
| import java.io.IOException; |
| import java.math.BigInteger; |
| |
| /** |
| * The GeneralSubtree structure, a part of the {@link NameConstraints} |
| * extension. |
| * |
| * <pre> |
| GeneralSubtree ::= SEQUENCE { |
| base GeneralName, |
| minimum [0] BaseDistance DEFAULT 0, |
| maximum [1] BaseDistance OPTIONAL } |
| |
| BaseDistance ::= INTEGER (0..MAX)</pre> |
| * |
| * @author Casey Marshall (csm@gnu.org) |
| */ |
| public class GeneralSubtree |
| { |
| private final GeneralName base; |
| private final int minimum; |
| private final int maximum; |
| |
| public GeneralSubtree(byte[] encoded) throws IOException |
| { |
| DERReader reader = new DERReader(encoded); |
| DERValue generalSubtree = reader.read(); |
| |
| if (!generalSubtree.isConstructed()) |
| throw new IOException("malformed GeneralSubtree"); |
| |
| DERValue generalName = reader.read(); |
| base = new GeneralName(generalName.getEncoded()); |
| if (generalName.isConstructed()) |
| reader.skip(generalName.getLength()); |
| |
| int len = generalName.getEncodedLength(); |
| if (len < generalSubtree.getLength()) |
| { |
| DERValue distance = reader.read(); |
| if (distance.getTag() == 0) |
| { |
| minimum = ((BigInteger) distance.getValue()).intValue(); |
| len += distance.getEncodedLength(); |
| if (len < generalSubtree.getLength()) |
| { |
| distance = reader.read(); |
| if (distance.getTag() != 1) |
| throw new IOException("unexpected tag " |
| + distance.getTag() + |
| " (expected 1 for GeneralSubtree maximum distance)"); |
| maximum = ((BigInteger) distance.getValue()).intValue(); |
| } |
| else |
| { |
| maximum = -1; |
| } |
| } |
| else if (distance.getTag() == 1) |
| { |
| minimum = 1; |
| maximum = ((BigInteger) distance.getValue()).intValue(); |
| } |
| else |
| { |
| throw new IOException("unexpected tag " + distance.getTag() |
| + " (expected 0 or 1 for GeneralSubtree distance)"); |
| } |
| } |
| else |
| { |
| minimum = 0; |
| maximum = -1; |
| } |
| } |
| |
| /** |
| * Returns the base name. |
| * |
| * @return The base name. |
| */ |
| public GeneralName base() |
| { |
| return base; |
| } |
| |
| /** |
| * Returns the minimum base distance, possibly zero. |
| * |
| * @return The minimum base distance. |
| */ |
| public int minimum() |
| { |
| return minimum; |
| } |
| |
| /** |
| * Returns the maximum base distance, or -1 if this value was not specified. |
| * |
| * @return The maximum base distance. |
| */ |
| public int maximum() |
| { |
| return maximum; |
| } |
| |
| public String toString() |
| { |
| return (GeneralSubtree.class.getName() + " [ base=" + base |
| + "; minimum=" + minimum + "; maximim=" + maximum |
| + " ]"); |
| } |
| } |