| /* |
| * 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.compressors.xz; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import org.tukaani.xz.XZ; |
| import org.tukaani.xz.SingleXZInputStream; |
| import org.tukaani.xz.XZInputStream; |
| |
| import org.apache.commons.compress.compressors.CompressorInputStream; |
| |
| /** |
| * XZ decompressor. |
| * @since 1.4 |
| */ |
| public class XZCompressorInputStream extends CompressorInputStream { |
| private final InputStream in; |
| |
| /** |
| * Checks if the signature matches what is expected for a .xz file. |
| * |
| * @param signature the bytes to check |
| * @param length the number of bytes to check |
| * @return true if signature matches the .xz magic bytes, false otherwise |
| */ |
| public static boolean matches(byte[] signature, int length) { |
| if (length < XZ.HEADER_MAGIC.length) { |
| return false; |
| } |
| |
| for (int i = 0; i < XZ.HEADER_MAGIC.length; ++i) { |
| if (signature[i] != XZ.HEADER_MAGIC[i]) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| /** |
| * Creates a new input stream that decompresses XZ-compressed data |
| * from the specified input stream. This doesn't support |
| * concatenated .xz files. |
| * |
| * @param inputStream where to read the compressed data |
| * |
| * @throws IOException if the input is not in the .xz format, |
| * the input is corrupt or truncated, the .xz |
| * headers specify options that are not supported |
| * by this implementation, or the underlying |
| * <code>inputStream</code> throws an exception |
| */ |
| public XZCompressorInputStream(InputStream inputStream) |
| throws IOException { |
| this(inputStream, false); |
| } |
| |
| /** |
| * Creates a new input stream that decompresses XZ-compressed data |
| * from the specified input stream. |
| * |
| * @param inputStream where to read the compressed data |
| * @param decompressConcatenated |
| * if true, decompress until the end of the |
| * input; if false, stop after the first .xz |
| * stream and leave the input position to point |
| * to the next byte after the .xz stream |
| * |
| * @throws IOException if the input is not in the .xz format, |
| * the input is corrupt or truncated, the .xz |
| * headers specify options that are not supported |
| * by this implementation, or the underlying |
| * <code>inputStream</code> throws an exception |
| */ |
| public XZCompressorInputStream(InputStream inputStream, |
| boolean decompressConcatenated) |
| throws IOException { |
| if (decompressConcatenated) { |
| in = new XZInputStream(inputStream); |
| } else { |
| in = new SingleXZInputStream(inputStream); |
| } |
| } |
| |
| @Override |
| public int read() throws IOException { |
| int ret = in.read(); |
| count(ret == -1 ? -1 : 1); |
| return ret; |
| } |
| |
| @Override |
| public int read(byte[] buf, int off, int len) throws IOException { |
| int ret = in.read(buf, off, len); |
| count(ret); |
| return ret; |
| } |
| |
| @Override |
| public long skip(long n) throws IOException { |
| return in.skip(n); |
| } |
| |
| @Override |
| public int available() throws IOException { |
| return in.available(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| in.close(); |
| } |
| } |