| /* |
| * 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 CoderBase { |
| LZMA2Decoder() { |
| super(LZMA2Options.class, Number.class); |
| } |
| |
| @Override |
| InputStream decode(final String archiveName, final InputStream in, long uncompressedLength, |
| final Coder coder, byte[] password) throws IOException { |
| try { |
| int dictionarySize = getDictionarySize(coder); |
| return new LZMA2InputStream(in, dictionarySize); |
| } catch (IllegalArgumentException ex) { |
| throw new IOException(ex.getMessage()); |
| } |
| } |
| |
| @Override |
| OutputStream encode(final OutputStream out, final Object opts) |
| throws IOException { |
| LZMA2Options options = getOptions(opts); |
| FinishableOutputStream wrapped = new FinishableWrapperOutputStream(out); |
| return options.getOutputStream(wrapped); |
| } |
| |
| @Override |
| byte[] getOptionsAsProperties(Object opts) { |
| int dictSize = getDictSize(opts); |
| int lead = Integer.numberOfLeadingZeros(dictSize); |
| int secondBit = (dictSize >>> (30 - lead)) - 2; |
| return new byte[] { |
| (byte) ((19 - lead) * 2 + secondBit) |
| }; |
| } |
| |
| @Override |
| Object getOptionsFromCoder(Coder coder, InputStream in) { |
| return getDictionarySize(coder); |
| } |
| |
| private int getDictSize(Object opts) { |
| if (opts instanceof LZMA2Options) { |
| return ((LZMA2Options) opts).getDictSize(); |
| } |
| return numberOptionOrDefault(opts); |
| } |
| |
| private int getDictionarySize(Coder coder) throws IllegalArgumentException { |
| final int dictionarySizeBits = 0xff & coder.properties[0]; |
| if ((dictionarySizeBits & (~0x3f)) != 0) { |
| throw new IllegalArgumentException("Unsupported LZMA2 property bits"); |
| } |
| if (dictionarySizeBits > 40) { |
| throw new IllegalArgumentException("Dictionary larger than 4GiB maximum size"); |
| } |
| if (dictionarySizeBits == 40) { |
| return 0xFFFFffff; |
| } |
| return (2 | (dictionarySizeBits & 0x1)) << (dictionarySizeBits / 2 + 11); |
| } |
| |
| private LZMA2Options getOptions(Object opts) throws IOException { |
| if (opts instanceof LZMA2Options) { |
| return (LZMA2Options) opts; |
| } |
| LZMA2Options options = new LZMA2Options(); |
| options.setDictSize(numberOptionOrDefault(opts)); |
| return options; |
| } |
| |
| private int numberOptionOrDefault(Object opts) { |
| return numberOptionOrDefault(opts, LZMA2Options.DICT_SIZE_DEFAULT); |
| } |
| } |