| /* CascadeTransformer.java -- |
| Copyright (C) 2003, 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.javax.crypto.assembly; |
| |
| import java.security.InvalidKeyException; |
| import java.util.Map; |
| |
| /** |
| * An Adapter to use any {@link Cascade} as a {@link Transformer} in an |
| * {@link Assembly}. |
| */ |
| class CascadeTransformer |
| extends Transformer |
| { |
| private Cascade delegate; |
| |
| private int blockSize; |
| |
| CascadeTransformer(Cascade delegate) |
| { |
| super(); |
| |
| this.delegate = delegate; |
| } |
| |
| void initDelegate(Map attributes) throws TransformerException |
| { |
| attributes.put(Cascade.DIRECTION, wired); |
| try |
| { |
| delegate.init(attributes); |
| } |
| catch (InvalidKeyException x) |
| { |
| throw new TransformerException("initDelegate()", x); |
| } |
| blockSize = delegate.currentBlockSize(); |
| } |
| |
| int delegateBlockSize() |
| { |
| return blockSize; |
| } |
| |
| void resetDelegate() |
| { |
| delegate.reset(); |
| blockSize = 0; |
| } |
| |
| byte[] updateDelegate(byte[] in, int offset, int length) |
| throws TransformerException |
| { |
| byte[] result = updateInternal(in, offset, length); |
| return result; |
| } |
| |
| byte[] lastUpdateDelegate() throws TransformerException |
| { |
| if (inBuffer.size() != 0) |
| { |
| IllegalStateException cause = new IllegalStateException( |
| "Cascade transformer, after last update, must be empty but isn't"); |
| throw new TransformerException("lastUpdateDelegate()", cause); |
| } |
| return new byte[0]; |
| } |
| |
| private byte[] updateInternal(byte[] in, int offset, int length) |
| { |
| byte[] result; |
| for (int i = 0; i < length; i++) |
| { |
| inBuffer.write(in[offset++] & 0xFF); |
| if (inBuffer.size() >= blockSize) |
| { |
| result = inBuffer.toByteArray(); |
| inBuffer.reset(); |
| delegate.update(result, 0, result, 0); |
| outBuffer.write(result, 0, blockSize); |
| } |
| } |
| result = outBuffer.toByteArray(); |
| outBuffer.reset(); |
| return result; |
| } |
| } |