| /* |
| * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package jdk.internal.jimage.decompressor; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.nio.ByteOrder; |
| import java.nio.charset.StandardCharsets; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.Properties; |
| import jdk.internal.jimage.decompressor.ResourceDecompressor.StringsProvider; |
| |
| /** |
| * Entry point to decompress resources. |
| * |
| * @implNote This class needs to maintain JDK 8 source compatibility. |
| * |
| * It is used internally in the JDK to implement jimage/jrtfs access, |
| * but also compiled and delivered as part of the jrtfs.jar to support access |
| * to the jimage file provided by the shipped JDK by tools running on JDK 8. |
| */ |
| public final class Decompressor { |
| |
| private final Map<Integer, ResourceDecompressor> pluginsCache = new HashMap<>(); |
| |
| public Decompressor() { |
| } |
| |
| /** |
| * Decompress a resource. |
| * @param order Byte order. |
| * @param provider Strings provider |
| * @param content The resource content to uncompress. |
| * @return A fully uncompressed resource. |
| * @throws IOException |
| */ |
| public byte[] decompressResource(ByteOrder order, StringsProvider provider, |
| byte[] content) throws IOException { |
| Objects.requireNonNull(order); |
| Objects.requireNonNull(provider); |
| Objects.requireNonNull(content); |
| CompressedResourceHeader header; |
| do { |
| header = CompressedResourceHeader.readFromResource(order, content); |
| if (header != null) { |
| ResourceDecompressor decompressor = |
| pluginsCache.get(header.getDecompressorNameOffset()); |
| if (decompressor == null) { |
| String pluginName = |
| provider.getString(header.getDecompressorNameOffset()); |
| if (pluginName == null) { |
| throw new IOException("Plugin name not found"); |
| } |
| String storedContent = header.getStoredContent(provider); |
| Properties props = new Properties(); |
| if (storedContent != null) { |
| try (ByteArrayInputStream stream |
| = new ByteArrayInputStream(storedContent. |
| getBytes(StandardCharsets.UTF_8));) { |
| props.loadFromXML(stream); |
| } |
| } |
| decompressor = ResourceDecompressorRepository. |
| newResourceDecompressor(props, pluginName); |
| if (decompressor == null) { |
| throw new IOException("Plugin not found: " + pluginName); |
| } |
| |
| pluginsCache.put(header.getDecompressorNameOffset(), decompressor); |
| } |
| try { |
| content = decompressor.decompress(provider, content, |
| CompressedResourceHeader.getSize(), header.getUncompressedSize()); |
| } catch (Exception ex) { |
| throw new IOException(ex); |
| } |
| } |
| } while (header != null); |
| return content; |
| } |
| } |