296 lines
11 KiB
Java
296 lines
11 KiB
Java
/*
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* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* ZIP inflater/deflater performance.
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*/
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/*
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* Run this test on JDK 6 and on later
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* JDKs to compare results:
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* java -server -Xms1024M -Xmx1024M -Ddebug=true FlaterCriticalArray
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*
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* The performance issues can be readily seen on JDK 6, and so this code is
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* written to compile on that platform: it does *not* use any JDK 7 - specific
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* features.
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*/
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import java.io.*;
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import java.nio.*;
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import java.util.*;
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import java.util.zip.*;
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public class FlaterCriticalArray {
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// If true, print information about performance
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private static final boolean debug = System.getProperty("debug") != null;
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private static void debug(String s) {
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if (debug) System.out.println(s);
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}
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private static void debug(String name, String inOut, long time, int length) {
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debug(name + ": Duration of " + inOut + "(in ms): " + time);
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debug(name + ": " + inOut + "d data length: " + length + " bytes");
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}
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private static byte[] grow(byte[] a, int capacity) {
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while (a.length < capacity) {
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byte[] a2 = new byte[a.length * 2];
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System.arraycopy(a, 0, a2, 0, a.length);
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a = a2;
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}
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return a;
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}
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private static byte[] trim(byte[] a, int length) {
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byte[] res = new byte[length];
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System.arraycopy(a, 0, res, 0, length);
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return res;
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}
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/*
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* Base class for individual test cases
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*/
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private abstract static class TestCase {
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protected String name; // For information in debug messages
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protected byte data[]; // Data to be deflated and subsequently inflated
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protected int level; // Compression level for deflater
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protected TestCase(String name, byte data[]) {
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this(name, data, -1);
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}
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protected TestCase(String name, byte data[], int level) {
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this.name = name;
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this.data = data;
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this.level = level;
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}
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public void runTest() throws Throwable {
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long time0, time1;
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byte deflated[], inflated[];
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debug("");
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time0 = System.currentTimeMillis();
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deflated = deflate(data, level);
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time1 = System.currentTimeMillis();
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inform("Deflate", time1 - time0, deflated.length);
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time0 = System.currentTimeMillis();
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inflated = inflate(deflated);
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time1 = System.currentTimeMillis();
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inform("Inflate", time1 - time0, inflated.length);
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check(Arrays.equals(data, inflated),
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name + ": Inflated and deflated arrays do not match");
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}
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private void inform(String inOut, long duration, int length) {
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debug(name, inOut, duration, length);
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}
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protected abstract byte[] deflate(byte data[], int level) throws Throwable;
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protected abstract byte[] inflate(byte deflated[]) throws Throwable;
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}
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/*
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* Following are the individual test cases
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*/
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private static class StrideTest extends TestCase {
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static final int STRIDE = 1024;
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public StrideTest(byte data[], int level) {
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super("STRIDE", data, level);
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}
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protected byte[] deflate(byte in[], int level) throws Throwable {
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final int len = in.length;
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final Deflater deflater = new Deflater(level);
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final byte[] smallBuffer = new byte[32];
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byte[] flated = new byte[32];
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int count = 0;
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for (int i = 0; i<len; i+= STRIDE) {
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deflater.setInput(in, i, Math.min(STRIDE, len-i));
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while (!deflater.needsInput()) {
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int n = deflater.deflate(smallBuffer);
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flated = grow(flated, count + n);
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System.arraycopy(smallBuffer, 0, flated, count, n);
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count += n;
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}
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}
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deflater.finish();
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int n;
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do {
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n = deflater.deflate(smallBuffer);
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flated = grow(flated, count + n);
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System.arraycopy(smallBuffer, 0, flated, count, n);
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count += n;
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} while (n > 0);
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return trim(flated, count);
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}
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protected byte[] inflate(byte in[]) throws Throwable {
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final int len = in.length;
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final Inflater inflater = new Inflater();
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final byte[] smallBuffer = new byte[3200];
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byte[] flated = new byte[32];
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int count = 0;
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for (int i = 0; i<len; i+= STRIDE) {
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inflater.setInput(in, i, Math.min(STRIDE, len-i));
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while (!inflater.needsInput()) {
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int n;
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while ((n = inflater.inflate(smallBuffer)) > 0) {
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flated = grow(flated, count + n);
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System.arraycopy(smallBuffer, 0, flated, count, n);
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count += n;
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}
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}
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}
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return trim(flated, count);
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}
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}
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private static class NoStrideTest extends TestCase {
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public NoStrideTest(byte data[], int level) {
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super("NO STRIDE", data, level);
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}
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public byte[] deflate(byte in[], int level) throws Throwable {
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final Deflater flater = new Deflater(level);
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flater.setInput(in);
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flater.finish();
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final byte[] smallBuffer = new byte[32];
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byte[] flated = new byte[32];
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int count = 0;
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int n;
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while ((n = flater.deflate(smallBuffer)) > 0) {
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flated = grow(flated, count + n);
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System.arraycopy(smallBuffer, 0, flated, count, n);
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count += n;
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}
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return trim(flated, count);
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}
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public byte[] inflate(byte in[]) throws Throwable {
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final Inflater flater = new Inflater();
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flater.setInput(in);
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final byte[] smallBuffer = new byte[32];
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byte[] flated = new byte[32];
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int count = 0;
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int n;
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while ((n = flater.inflate(smallBuffer)) > 0) {
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flated = grow(flated, count + n);
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System.arraycopy(smallBuffer, 0, flated, count, n);
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count += n;
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}
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return trim(flated, count);
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}
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}
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/**
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* Check Deflater{In,Out}putStream by way of GZIP{In,Out}putStream
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*/
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private static class GZIPTest extends TestCase {
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public GZIPTest(byte data[]) {
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super("GZIP", data);
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}
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public byte[] deflate(byte data[], int ignored) throws Throwable {
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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OutputStream gzos = new GZIPOutputStream(baos);
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gzos.write(data, 0, data.length);
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gzos.close();
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return baos.toByteArray();
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}
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public byte[] inflate(byte deflated[]) throws Throwable {
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InputStream bais = new ByteArrayInputStream(deflated);
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GZIPInputStream gzis = new GZIPInputStream(bais);
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byte[] inflated = new byte[data.length];
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int numRead = 0;
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int count = 0;
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while ((numRead = gzis.read(inflated, count, data.length - count)) > 0) {
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count += numRead;
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}
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check(count == data.length, name + ": Read " + count + "; expected " + data.length);
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return inflated;
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}
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}
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public static void realMain(String[] args) throws Throwable {
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byte data[];
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int level = -1;
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if (args.length > 0) {
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level = Integer.parseInt(args[0]);
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}
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debug("Using level " + level);
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if (args.length > 1) {
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FileInputStream fis = new FileInputStream(args[1]);
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int len = fis.available();
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data = new byte[len];
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check(fis.read(data, 0, len) == len, "Did not read complete file");
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debug("Original data from " + args[1]);
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fis.close();
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} else {
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ByteBuffer bb = ByteBuffer.allocate(8);
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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for (int i = 0; i < 1024 * 64; i++) { // data length
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bb.putDouble(0, Math.random());
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baos.write(bb.array(), 0, 8);
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}
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data = baos.toByteArray();
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debug("Original data from random byte array");
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}
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debug("Original data length: " + data.length + " bytes");
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new StrideTest(data, level).runTest();
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new NoStrideTest(data, level).runTest();
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new GZIPTest(data).runTest();
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}
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//--------------------- Infrastructure ---------------------------
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static volatile int passed = 0, failed = 0;
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static void pass() {passed++;}
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static void pass(String msg) {System.out.println(msg); passed++;}
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static void fail() {failed++; Thread.dumpStack();}
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static void fail(String msg) {System.out.println(msg); fail();}
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static void unexpected(Throwable t) {failed++; t.printStackTrace();}
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static void unexpected(Throwable t, String msg) {
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System.out.println(msg); failed++; t.printStackTrace();}
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static boolean check(boolean cond) {if (cond) pass(); else fail(); return cond;}
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static boolean check(boolean cond, String msg) {if (cond) pass(); else fail(msg); return cond;}
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static void equal(Object x, Object y) {
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if (x == null ? y == null : x.equals(y)) pass();
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else fail(x + " not equal to " + y);}
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public static void main(String[] args) throws Throwable {
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try {realMain(args);} catch (Throwable t) {unexpected(t);}
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System.out.println("\nPassed = " + passed + " failed = " + failed);
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if (failed > 0) throw new AssertionError("Some tests failed");}
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}
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