/*
* 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.FinishableWrapperOutputStream;
import org.tukaani.xz.FinishableOutputStream;
import org.tukaani.xz.LZMA2InputStream;
import org.tukaani.xz.LZMA2Options;
class LZMA2Decoder extends Coders.CoderBase {
@Override
InputStream decode(final InputStream in, final Coder coder, byte[] password)
throws IOException {
final int dictionarySizeBits = 0xff & coder.properties[0];
if ((dictionarySizeBits & (~0x3f)) != 0) {
throw new IOException("Unsupported LZMA2 property bits");
}
if (dictionarySizeBits > 40) {
throw new IOException("Dictionary larger than 4GiB maximum size");
}
final int dictionarySize;
if (dictionarySizeBits == 40) {
dictionarySize = 0xFFFFffff;
} else {
dictionarySize = (2 | (dictionarySizeBits & 0x1)) << (dictionarySizeBits / 2 + 11);
}
return new LZMA2InputStream(in, dictionarySize);
}
@Override
OutputStream encode(final OutputStream out, final byte[] password)
throws IOException {
LZMA2Options options = new LZMA2Options();
options.setDictSize(LZMA2Options.DICT_SIZE_DEFAULT);
FinishableOutputStream wrapped = new FinishableWrapperOutputStream(out);
return options.getOutputStream(wrapped);
}
}