/*
* Copyright (c) 2011, 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.
*
* 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.
*/
/**
* ZIP inflater/deflater performance.
*/
/*
* Run this test on JDK 6 and on later
* JDKs to compare results:
* java -server -Xms1024M -Xmx1024M -Ddebug=true FlaterCriticalArray
*
* The performance issues can be readily seen on JDK 6, and so this code is
* written to compile on that platform: it does *not* use any JDK 7 - specific
* features.
*/
import java.io.*;
import java.nio.*;
import java.util.*;
import java.util.zip.*;
public class FlaterCriticalArray {
// If true, print information about performance
private static final boolean debug = System.getProperty("debug") != null;
private static void debug(String s) {
if (debug) System.out.println(s);
}
private static void debug(String name, String inOut, long time, int length) {
debug(name + ": Duration of " + inOut + "(in ms): " + time);
debug(name + ": " + inOut + "d data length: " + length + " bytes");
}
private static byte[] grow(byte[] a, int capacity) {
while (a.length < capacity) {
byte[] a2 = new byte[a.length * 2];
System.arraycopy(a, 0, a2, 0, a.length);
a = a2;
}
return a;
}
private static byte[] trim(byte[] a, int length) {
byte[] res = new byte[length];
System.arraycopy(a, 0, res, 0, length);
return res;
}
/*
* Base class for individual test cases
*/
abstract static private class TestCase {
protected String name; // For information in debug messages
protected byte data[]; // Data to be deflated and subsequently inflated
protected int level; // Compression level for deflater
protected TestCase(String name, byte data[]) {
this(name, data, -1);
}
protected TestCase(String name, byte data[], int level) {
this.name = name;
this.data = data;
this.level = level;
}
public void runTest() throws Throwable {
long time0, time1;
byte deflated[], inflated[];
debug("");
time0 = System.currentTimeMillis();
deflated = deflate(data, level);
time1 = System.currentTimeMillis();
inform("Deflate", time1 - time0, deflated.length);
time0 = System.currentTimeMillis();
inflated = inflate(deflated);
time1 = System.currentTimeMillis();
inform("Inflate", time1 - time0, inflated.length);
check(Arrays.equals(data, inflated),
name + ": Inflated and deflated arrays do not match");
}
private void inform(String inOut, long duration, int length) {
debug(name, inOut, duration, length);
}
abstract protected byte[] deflate(byte data[], int level) throws Throwable;
abstract protected byte[] inflate(byte deflated[]) throws Throwable;
}
/*
* Following are the individual test cases
*/
private static class StrideTest extends TestCase {
static final int STRIDE = 1024;
public StrideTest(byte data[], int level) {
super("STRIDE", data, level);
}
protected byte[] deflate(byte in[], int level) throws Throwable {
final int len = in.length;
final Deflater deflater = new Deflater(level);
final byte[] smallBuffer = new byte[32];
byte[] flated = new byte[32];
int count = 0;
for (int i = 0; i<len; i+= STRIDE) {
deflater.setInput(in, i, Math.min(STRIDE, len-i));
while (!deflater.needsInput()) {
int n = deflater.deflate(smallBuffer);
flated = grow(flated, count + n);
System.arraycopy(smallBuffer, 0, flated, count, n);
count += n;
}
}
deflater.finish();
int n;
do {
n = deflater.deflate(smallBuffer);
flated = grow(flated, count + n);
System.arraycopy(smallBuffer, 0, flated, count, n);
count += n;
} while (n > 0);
return trim(flated, count);
}
protected byte[] inflate(byte in[]) throws Throwable {
final int len = in.length;
final Inflater inflater = new Inflater();
final byte[] smallBuffer = new byte[3200];
byte[] flated = new byte[32];
int count = 0;
for (int i = 0; i<len; i+= STRIDE) {
inflater.setInput(in, i, Math.min(STRIDE, len-i));
while (!inflater.needsInput()) {
int n;
while ((n = inflater.inflate(smallBuffer)) > 0) {
flated = grow(flated, count + n);
System.arraycopy(smallBuffer, 0, flated, count, n);
count += n;
}
}
}
return trim(flated, count);
}
}
private static class NoStrideTest extends TestCase {
public NoStrideTest(byte data[], int level) {
super("NO STRIDE", data, level);
}
public byte[] deflate(byte in[], int level) throws Throwable {
final Deflater flater = new Deflater(level);
flater.setInput(in);
flater.finish();
final byte[] smallBuffer = new byte[32];
byte[] flated = new byte[32];
int count = 0;
int n;
while ((n = flater.deflate(smallBuffer)) > 0) {
flated = grow(flated, count + n);
System.arraycopy(smallBuffer, 0, flated, count, n);
count += n;
}
return trim(flated, count);
}
public byte[] inflate(byte in[]) throws Throwable {
final Inflater flater = new Inflater();
flater.setInput(in);
final byte[] smallBuffer = new byte[32];
byte[] flated = new byte[32];
int count = 0;
int n;
while ((n = flater.inflate(smallBuffer)) > 0) {
flated = grow(flated, count + n);
System.arraycopy(smallBuffer, 0, flated, count, n);
count += n;
}
return trim(flated, count);
}
}
/**
* Check Deflater{In,Out}putStream by way of GZIP{In,Out}putStream
*/
private static class GZIPTest extends TestCase {
public GZIPTest(byte data[]) {
super("GZIP", data);
}
public byte[] deflate(byte data[], int ignored) throws Throwable {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
OutputStream gzos = new GZIPOutputStream(baos);
gzos.write(data, 0, data.length);
gzos.close();
return baos.toByteArray();
}
public byte[] inflate(byte deflated[]) throws Throwable {
InputStream bais = new ByteArrayInputStream(deflated);
GZIPInputStream gzis = new GZIPInputStream(bais);
byte[] inflated = new byte[data.length];
int numRead = 0;
int count = 0;
while ((numRead = gzis.read(inflated, count, data.length - count)) > 0) {
count += numRead;
}
check(count == data.length, name + ": Read " + count + "; expected " + data.length);
return inflated;
}
}
public static void realMain(String[] args) throws Throwable {
byte data[];
int level = -1;
if (args.length > 0) {
level = Integer.parseInt(args[0]);
}
debug("Using level " + level);
if (args.length > 1) {
FileInputStream fis = new FileInputStream(args[1]);
int len = fis.available();
data = new byte[len];
check(fis.read(data, 0, len) == len, "Did not read complete file");
debug("Original data from " + args[1]);
fis.close();
} else {
ByteBuffer bb = ByteBuffer.allocate(8);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
for (int i = 0; i < 1024 * 64; i++) { // data length
bb.putDouble(0, Math.random());
baos.write(bb.array(), 0, 8);
}
data = baos.toByteArray();
debug("Original data from random byte array");
}
debug("Original data length: " + data.length + " bytes");
new StrideTest(data, level).runTest();
new NoStrideTest(data, level).runTest();
new GZIPTest(data).runTest();
}
//--------------------- Infrastructure ---------------------------
static volatile int passed = 0, failed = 0;
static void pass() {passed++;}
static void pass(String msg) {System.out.println(msg); passed++;}
static void fail() {failed++; Thread.dumpStack();}
static void fail(String msg) {System.out.println(msg); fail();}
static void unexpected(Throwable t) {failed++; t.printStackTrace();}
static void unexpected(Throwable t, String msg) {
System.out.println(msg); failed++; t.printStackTrace();}
static boolean check(boolean cond) {if (cond) pass(); else fail(); return cond;}
static boolean check(boolean cond, String msg) {if (cond) pass(); else fail(msg); return cond;}
static void equal(Object x, Object y) {
if (x == null ? y == null : x.equals(y)) pass();
else fail(x + " not equal to " + y);}
public static void main(String[] args) throws Throwable {
try {realMain(args);} catch (Throwable t) {unexpected(t);}
System.out.println("\nPassed = " + passed + " failed = " + failed);
if (failed > 0) throw new AssertionError("Some tests failed");}
}