| /* |
| * 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. |
| * |
| */ |
| package org.apache.commons.compress.archivers.sevenz; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import org.tukaani.xz.DeltaOptions; |
| import org.tukaani.xz.FinishableWrapperOutputStream; |
| import org.tukaani.xz.UnsupportedOptionsException; |
| |
| class DeltaDecoder extends CoderBase { |
| DeltaDecoder() { |
| super(Number.class); |
| } |
| |
| @Override |
| InputStream decode(final String archiveName, final InputStream in, long uncompressedLength, |
| final Coder coder, byte[] password) throws IOException { |
| return new DeltaOptions(getOptionsFromCoder(coder)).getInputStream(in); |
| } |
| |
| @Override |
| OutputStream encode(final OutputStream out, final Object options) throws IOException { |
| int distance = numberOptionOrDefault(options, 1); |
| try { |
| return new DeltaOptions(distance).getOutputStream(new FinishableWrapperOutputStream(out)); |
| } catch (UnsupportedOptionsException ex) { |
| throw new IOException(ex.getMessage()); |
| } |
| } |
| |
| @Override |
| byte[] getOptionsAsProperties(Object options) { |
| return new byte[] { |
| (byte) (numberOptionOrDefault(options, 1) - 1) |
| }; |
| } |
| |
| @Override |
| Object getOptionsFromCoder(Coder coder, InputStream in) { |
| return getOptionsFromCoder(coder); |
| } |
| |
| private int getOptionsFromCoder(Coder coder) { |
| if (coder.properties == null || coder.properties.length == 0) { |
| return 1; |
| } |
| return (0xff & coder.properties[0]) + 1; |
| } |
| } |