1 /* 2 * Copyright (c) 2011, 2017, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * @test 26 * @bug 7110149 8184306 27 * @summary Test basic deflater & inflater functionality 28 * @key randomness 29 */ 30 31 import java.io.*; 32 import java.util.*; 33 import java.util.zip.*; 34 35 public class DeInflate { 36 37 static void checkStream(Deflater def, byte[] in, int len, 38 byte[] out1, byte[] out2, boolean nowrap) 39 throws Throwable 40 { 41 Arrays.fill(out1, (byte)0); 42 Arrays.fill(out2, (byte)0); 43 44 ByteArrayOutputStream baos = new ByteArrayOutputStream(); 45 try (DeflaterOutputStream defos = new DeflaterOutputStream(baos, def)) { 46 defos.write(in, 0, len); 47 } 48 out1 = baos.toByteArray(); 49 int m = out1.length; 50 51 Inflater inf = new Inflater(nowrap); 52 inf.setInput(out1, 0, m); 53 int n = inf.inflate(out2); 54 55 if (n != len || 56 !Arrays.equals(Arrays.copyOf(in, len), Arrays.copyOf(out2, len)) || 57 inf.inflate(out2) != 0) { 58 System.out.printf("m=%d, n=%d, len=%d, eq=%b%n", 59 m, n, len, Arrays.equals(in, out2)); 60 throw new RuntimeException("De/inflater failed:" + def); 61 } 62 } 63 64 static void check(Deflater def, byte[] in, int len, 65 byte[] out1, byte[] out2, boolean nowrap) 66 throws Throwable 67 { 68 Arrays.fill(out1, (byte)0); 69 Arrays.fill(out2, (byte)0); 70 71 def.setInput(in, 0, len); 72 def.finish(); 73 int m = def.deflate(out1); 74 75 Inflater inf = new Inflater(nowrap); 76 inf.setInput(out1, 0, m); 77 int n = inf.inflate(out2); 78 79 if (n != len || 80 !Arrays.equals(Arrays.copyOf(in, len), Arrays.copyOf(out2, len)) || 81 inf.inflate(out2) != 0) { 82 System.out.printf("m=%d, n=%d, len=%d, eq=%b%n", 83 m, n, len, Arrays.equals(in, out2)); 84 throw new RuntimeException("De/inflater failed:" + def); 85 } 86 } 87 88 private static Deflater newDeflater(int level, int strategy, boolean dowrap, byte[] tmp) { 89 Deflater def = new Deflater(level, dowrap); 90 if (strategy != Deflater.DEFAULT_STRATEGY) { 91 def.setStrategy(strategy); 92 // The first invocation after setLevel/Strategy() 93 // with a different level/stragety returns 0, if 94 // there is no need to flush out anything for the 95 // previous setting/"data", this is tricky and 96 // appears un-documented. 97 def.deflate(tmp); 98 } 99 return def; 100 } 101 102 private static Deflater resetDeflater(Deflater def, int level, int strategy) { 103 def.setLevel(level); 104 def.setStrategy(strategy); 105 def.reset(); 106 return def; 107 } 108 109 public static void main(String[] args) throws Throwable { 110 111 byte[] dataIn = new byte[1024 * 512]; 112 new Random().nextBytes(dataIn); 113 byte[] dataOut1 = new byte[dataIn.length + 1024]; 114 byte[] dataOut2 = new byte[dataIn.length]; 115 116 Deflater defNotWrap = new Deflater(Deflater.DEFAULT_COMPRESSION, false); 117 Deflater defWrap = new Deflater(Deflater.DEFAULT_COMPRESSION, true); 118 119 for (int level = Deflater.DEFAULT_COMPRESSION; 120 level <= Deflater.BEST_COMPRESSION; level++) { 121 for (int strategy = Deflater.DEFAULT_STRATEGY; 122 strategy <= Deflater.HUFFMAN_ONLY; strategy++) { 123 for (boolean dowrap : new boolean[] { false, true }) { 124 System.out.println("level:" + level + 125 ", strategy: " + strategy + 126 ", dowrap: " + dowrap); 127 for (int i = 0; i < 5; i++) { 128 int len = (i == 0)? dataIn.length 129 : new Random().nextInt(dataIn.length); 130 // use a new deflater 131 Deflater def = newDeflater(level, strategy, dowrap, dataOut2); 132 check(def, dataIn, len, dataOut1, dataOut2, dowrap); 133 134 // reuse the deflater (with reset) and test on stream, which 135 // uses a "smaller" buffer (smaller than the overall data) 136 def = resetDeflater(dowrap ? defWrap : defNotWrap, level, strategy); 137 checkStream(def, dataIn, len, dataOut1, dataOut2, dowrap); 138 } 139 } 140 } 141 } 142 } 143 }