1 /* 2 * Copyright (c) 2011, 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 6571338 27 * @summary Inflater should not require a buffer to the inflate() methods 28 * larger than 1 byte. 29 * @key randomness 30 */ 31 32 import java.io.*; 33 import java.nio.*; 34 import java.util.*; 35 import java.util.zip.*; 36 37 public class InflaterBufferSize { 38 private static final int DATA_LEN = 1024 *64; 39 private static byte[] data; 40 41 // If true, print extra info. 42 private static final boolean debug = System.getProperty("debug") != null; 43 debug(String s)44 private static void debug(String s) { 45 if (debug) System.out.println(s); 46 } 47 createData()48 private static void createData() { 49 ByteBuffer bb = ByteBuffer.allocate(8); 50 ByteArrayOutputStream baos = new ByteArrayOutputStream(); 51 for (int i = 0; i < DATA_LEN; i++) { 52 bb.putDouble(0, Math.random()); 53 baos.write(bb.array(), 0, 8); 54 } 55 data = baos.toByteArray(); 56 } 57 grow(byte[] a, int capacity)58 private static byte[] grow(byte[] a, int capacity) { 59 while (a.length < capacity) { 60 byte[] a2 = new byte[a.length * 2]; 61 System.arraycopy(a, 0, a2, 0, a.length); 62 a = a2; 63 } 64 return a; 65 } 66 trim(byte[] a, int length)67 private static byte[] trim(byte[] a, int length) { 68 byte[] res = new byte[length]; 69 System.arraycopy(a, 0, res, 0, length); 70 return res; 71 } 72 deflate(byte[] in, int level)73 private static byte[] deflate(byte[] in, int level) throws Throwable { 74 final Deflater flater = new Deflater(level); 75 flater.setInput(in); 76 flater.finish(); 77 final byte[] smallBuffer = new byte[32]; 78 byte[] flated = new byte[32]; 79 int count = 0; 80 int n; 81 while ((n = flater.deflate(smallBuffer)) > 0) { 82 flated = grow(flated, count + n); 83 System.arraycopy(smallBuffer, 0, flated, count, n); 84 count += n; 85 } 86 return trim(flated, count); 87 } 88 inflate(byte[] in)89 private static byte[] inflate(byte[] in) throws Throwable { 90 final Inflater flater = new Inflater(); 91 flater.setInput(in); 92 // This is the buffer of interest. It should be possible to use any 93 // non-zero size. 94 final byte[] smallBuffer = new byte[1]; 95 byte[] flated = new byte[32]; 96 int count = 0; 97 int n; 98 while ((n = flater.inflate(smallBuffer)) > 0) { 99 flated = grow(flated, count + n); 100 System.arraycopy(smallBuffer, 0, flated, count, n); 101 count += n; 102 } 103 return trim(flated, count); 104 } 105 realMain(String[] args)106 public static void realMain(String[] args) throws Throwable { 107 byte deflated[], inflated[]; 108 109 int level = -1; 110 if (args.length > 0) { 111 level = Integer.parseInt(args[0]); 112 } 113 debug("Using level " + level); 114 115 if (args.length > 1) { 116 FileInputStream fis = new FileInputStream(args[1]); 117 int len = fis.available(); 118 data = new byte[len]; 119 check(fis.read(data, 0, len) == len, "Did not read complete file"); 120 debug("Original data from " + args[1]); 121 fis.close(); 122 } else { 123 createData(); 124 debug("Original data from random byte array"); 125 } 126 debug("Original data length: " + data.length + " bytes"); 127 128 debug(""); 129 deflated = deflate(data, level); 130 debug("Deflated data length: " + deflated.length + " bytes"); 131 132 inflated = inflate(deflated); 133 debug("Inflated data length: "+ inflated.length + " bytes" ); 134 135 if (!check(Arrays.equals(data, inflated), 136 "Inflated and deflated arrays do not match")) { 137 OutputStream os = new BufferedOutputStream(new FileOutputStream("deflated.zip")); 138 try { 139 os.write(deflated); 140 } finally { 141 os.close(); 142 } 143 } 144 } 145 146 //--------------------- Infrastructure --------------------------- 147 static volatile int passed = 0, failed = 0; pass()148 static void pass() {passed++;} pass(String msg)149 static void pass(String msg) {System.out.println(msg); passed++;} fail()150 static void fail() {failed++; Thread.dumpStack();} fail(String msg)151 static void fail(String msg) {System.out.println(msg); fail();} unexpected(Throwable t)152 static void unexpected(Throwable t) {failed++; t.printStackTrace();} unexpected(Throwable t, String msg)153 static void unexpected(Throwable t, String msg) { 154 System.out.println(msg); failed++; t.printStackTrace();} check(boolean cond)155 static boolean check(boolean cond) {if (cond) pass(); else fail(); return cond;} check(boolean cond, String msg)156 static boolean check(boolean cond, String msg) {if (cond) pass(); else fail(msg); return cond;} equal(Object x, Object y)157 static void equal(Object x, Object y) { 158 if (x == null ? y == null : x.equals(y)) pass(); 159 else fail(x + " not equal to " + y);} main(String[] args)160 public static void main(String[] args) throws Throwable { 161 try {realMain(args);} catch (Throwable t) {unexpected(t);} 162 System.out.println("\nPassed = " + passed + " failed = " + failed); 163 if (failed > 0) throw new AssertionError("Some tests failed");} 164 } 165