1 /* 2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package jdk.internal.jimage.decompressor; 26 27 import java.io.ByteArrayOutputStream; 28 import java.io.IOException; 29 import java.util.zip.DataFormatException; 30 import java.util.zip.Inflater; 31 32 /** 33 * 34 * ZIP Decompressor 35 */ 36 final class ZipDecompressor implements ResourceDecompressor { 37 38 @Override 39 public String getName() { 40 return ZipDecompressorFactory.NAME; 41 } 42 43 static byte[] decompress(byte[] bytesIn, int offset) { 44 Inflater inflater = new Inflater(); 45 inflater.setInput(bytesIn, offset, bytesIn.length - offset); 46 ByteArrayOutputStream stream = new ByteArrayOutputStream(bytesIn.length - offset); 47 byte[] buffer = new byte[1024]; 48 49 while (!inflater.finished()) { 50 int count; 51 52 try { 53 count = inflater.inflate(buffer); 54 } catch (DataFormatException ex) { 55 return null; 56 } 57 58 stream.write(buffer, 0, count); 59 } 60 61 try { 62 stream.close(); 63 } catch (IOException ex) { 64 return null; 65 } 66 67 byte[] bytesOut = stream.toByteArray(); 68 inflater.end(); 69 70 return bytesOut; 71 } 72 73 @Override 74 public byte[] decompress(StringsProvider reader, byte[] content, int offset, 75 int originalSize) throws Exception { 76 byte[] decompressed = decompress(content, offset); 77 return decompressed; 78 } 79 }