/*
* 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 InputStream in, 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 Integer.valueOf(getOptionsFromCoder(coder));
}
private int getOptionsFromCoder(Coder coder) {
if (coder.properties == null || coder.properties.length == 0) {
return 1;
}
return (0xff & coder.properties[0]) + 1;
}
}