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The ZlibTest.java Java example source code
/*
* Copyright 2013 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.handler.codec.compression;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufInputStream;
import io.netty.buffer.Unpooled;
import io.netty.channel.embedded.EmbeddedChannel;
import io.netty.util.CharsetUtil;
import io.netty.util.ReferenceCountUtil;
import io.netty.util.internal.EmptyArrays;
import io.netty.util.internal.ThreadLocalRandom;
import org.junit.Test;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import static org.junit.Assert.*;
public abstract class ZlibTest {
private static final byte[] BYTES_SMALL = new byte[128];
private static final byte[] BYTES_LARGE = new byte[1024 * 1024];
private static final byte[] BYTES_LARGE2 = ("<!--?xml version=\"1.0\" encoding=\"ISO-8859-1\"?-->\n" +
"<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" " +
"\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n" +
"<html xmlns=\"http://www.w3.org/1999/xhtml\" xml:lang=\"en\" lang=\"en\">\n" +
" <title>Apache Tomcat\n" +
"</head>\n" +
'\n' +
"<body>\n" +
"<h1>It works !\n" +
'\n' +
"<p>If you're seeing this page via a web browser, it means you've setup Tomcat successfully." +
" Congratulations!</p>\n" +
" \n" +
"<p>This is the default Tomcat home page." +
" It can be found on the local filesystem at: <code>/var/lib/tomcat7/webapps/ROOT/index.html\n" +
'\n' +
"<p>Tomcat7 veterans might be pleased to learn that this system instance of Tomcat is installed with" +
" <code>CATALINA_HOME in /usr/share/tomcat7 and CATALINA_BASE in" +
" <code>/var/lib/tomcat7, following the rules from" +
" <code>/usr/share/doc/tomcat7-common/RUNNING.txt.gz.\n" +
'\n' +
"<p>You might consider installing the following packages, if you haven't already done so:\n" +
'\n' +
"<p>tomcat7-docs: This package installs a web application that allows to browse the Tomcat 7" +
" documentation locally. Once installed, you can access it by clicking <a href=\"docs/\">here.\n" +
'\n' +
"<p>tomcat7-examples: This package installs a web application that allows to access the Tomcat" +
" 7 Servlet and JSP examples. Once installed, you can access it by clicking" +
" <a href=\"examples/\">here.\n" +
'\n' +
"<p>tomcat7-admin: This package installs two web applications that can help managing this Tomcat" +
" instance. Once installed, you can access the <a href=\"manager/html\">manager webapp and" +
" the <a href=\"host-manager/html\">host-manager webapp.\n" +
'\n' +
"</p> NOTE: For security reasons, using the manager webapp is restricted" +
" to users with role \"manager\"." +
" The host-manager webapp is restricted to users with role \"admin\". Users are " +
"defined in <code>/etc/tomcat7/tomcat-users.xml. \n" +
'\n' +
'\n' +
'\n' +
"</body>").getBytes(CharsetUtil.UTF_8);
static {
ThreadLocalRandom rand = ThreadLocalRandom.current();
rand.nextBytes(BYTES_SMALL);
rand.nextBytes(BYTES_LARGE);
}
protected abstract ZlibEncoder createEncoder(ZlibWrapper wrapper);
protected abstract ZlibDecoder createDecoder(ZlibWrapper wrapper);
@Test
public void testGZIP2() throws Exception {
byte[] bytes = "message".getBytes(CharsetUtil.UTF_8);
ByteBuf data = Unpooled.wrappedBuffer(bytes);
ByteBuf deflatedData = Unpooled.wrappedBuffer(gzip(bytes));
EmbeddedChannel chDecoderGZip = new EmbeddedChannel(createDecoder(ZlibWrapper.GZIP));
try {
chDecoderGZip.writeInbound(deflatedData);
assertTrue(chDecoderGZip.finish());
ByteBuf buf = chDecoderGZip.readInbound();
assertEquals(buf, data);
assertNull(chDecoderGZip.readInbound());
data.release();
buf.release();
} finally {
dispose(chDecoderGZip);
}
}
private void testCompress0(ZlibWrapper encoderWrapper, ZlibWrapper decoderWrapper, ByteBuf data) throws Exception {
EmbeddedChannel chEncoder = new EmbeddedChannel(createEncoder(encoderWrapper));
EmbeddedChannel chDecoderZlib = new EmbeddedChannel(createDecoder(decoderWrapper));
try {
chEncoder.writeOutbound(data.retain());
chEncoder.flush();
data.resetReaderIndex();
for (;;) {
ByteBuf deflatedData = chEncoder.readOutbound();
if (deflatedData == null) {
break;
}
chDecoderZlib.writeInbound(deflatedData);
}
byte[] decompressed = new byte[data.readableBytes()];
int offset = 0;
for (;;) {
ByteBuf buf = chDecoderZlib.readInbound();
if (buf == null) {
break;
}
int length = buf.readableBytes();
buf.readBytes(decompressed, offset, length);
offset += length;
buf.release();
if (offset == decompressed.length) {
break;
}
}
assertEquals(data, Unpooled.wrappedBuffer(decompressed));
assertNull(chDecoderZlib.readInbound());
// Closing an encoder channel will generate a footer.
assertTrue(chEncoder.finish());
for (;;) {
Object msg = chEncoder.readOutbound();
if (msg == null) {
break;
}
ReferenceCountUtil.release(msg);
}
// But, the footer will be decoded into nothing. It's only for validation.
assertFalse(chDecoderZlib.finish());
data.release();
} finally {
dispose(chEncoder);
dispose(chDecoderZlib);
}
}
private void testCompressNone(ZlibWrapper encoderWrapper, ZlibWrapper decoderWrapper) throws Exception {
EmbeddedChannel chEncoder = new EmbeddedChannel(createEncoder(encoderWrapper));
EmbeddedChannel chDecoderZlib = new EmbeddedChannel(createDecoder(decoderWrapper));
try {
// Closing an encoder channel without writing anything should generate both header and footer.
assertTrue(chEncoder.finish());
for (;;) {
ByteBuf deflatedData = chEncoder.readOutbound();
if (deflatedData == null) {
break;
}
chDecoderZlib.writeInbound(deflatedData);
}
// Decoder should not generate anything at all.
boolean decoded = false;
for (;;) {
ByteBuf buf = chDecoderZlib.readInbound();
if (buf == null) {
break;
}
buf.release();
decoded = true;
}
assertFalse("should decode nothing", decoded);
assertFalse(chDecoderZlib.finish());
} finally {
dispose(chEncoder);
dispose(chDecoderZlib);
}
}
private static void dispose(EmbeddedChannel ch) {
if (ch.finish()) {
for (;;) {
Object msg = ch.readInbound();
if (msg == null) {
break;
}
ReferenceCountUtil.release(msg);
}
for (;;) {
Object msg = ch.readOutbound();
if (msg == null) {
break;
}
ReferenceCountUtil.release(msg);
}
}
}
// Test for https://github.com/netty/netty/issues/2572
private void testDecompressOnly(ZlibWrapper decoderWrapper, byte[] compressed, byte[] data) throws Exception {
EmbeddedChannel chDecoder = new EmbeddedChannel(createDecoder(decoderWrapper));
chDecoder.writeInbound(Unpooled.wrappedBuffer(compressed));
assertTrue(chDecoder.finish());
ByteBuf decoded = Unpooled.buffer(data.length);
for (;;) {
ByteBuf buf = chDecoder.readInbound();
if (buf == null) {
break;
}
decoded.writeBytes(buf);
buf.release();
}
assertEquals(Unpooled.wrappedBuffer(data), decoded);
decoded.release();
}
private void testCompressSmall(ZlibWrapper encoderWrapper, ZlibWrapper decoderWrapper) throws Exception {
testCompress0(encoderWrapper, decoderWrapper, Unpooled.wrappedBuffer(BYTES_SMALL));
testCompress0(encoderWrapper, decoderWrapper,
Unpooled.directBuffer(BYTES_SMALL.length).writeBytes(BYTES_SMALL));
}
private void testCompressLarge(ZlibWrapper encoderWrapper, ZlibWrapper decoderWrapper) throws Exception {
testCompress0(encoderWrapper, decoderWrapper, Unpooled.wrappedBuffer(BYTES_LARGE));
testCompress0(encoderWrapper, decoderWrapper,
Unpooled.directBuffer(BYTES_LARGE.length).writeBytes(BYTES_LARGE));
}
@Test
public void testZLIB() throws Exception {
testCompressNone(ZlibWrapper.ZLIB, ZlibWrapper.ZLIB);
testCompressSmall(ZlibWrapper.ZLIB, ZlibWrapper.ZLIB);
testCompressLarge(ZlibWrapper.ZLIB, ZlibWrapper.ZLIB);
testDecompressOnly(ZlibWrapper.ZLIB, deflate(BYTES_LARGE2), BYTES_LARGE2);
}
@Test
public void testNONE() throws Exception {
testCompressNone(ZlibWrapper.NONE, ZlibWrapper.NONE);
testCompressSmall(ZlibWrapper.NONE, ZlibWrapper.NONE);
testCompressLarge(ZlibWrapper.NONE, ZlibWrapper.NONE);
}
@Test
public void testGZIP() throws Exception {
testCompressNone(ZlibWrapper.GZIP, ZlibWrapper.GZIP);
testCompressSmall(ZlibWrapper.GZIP, ZlibWrapper.GZIP);
testCompressLarge(ZlibWrapper.GZIP, ZlibWrapper.GZIP);
testDecompressOnly(ZlibWrapper.GZIP, gzip(BYTES_LARGE2), BYTES_LARGE2);
}
@Test
public void testGZIPCompressOnly() throws Exception {
testGZIPCompressOnly0(null); // Do not write anything; just finish the stream.
testGZIPCompressOnly0(EmptyArrays.EMPTY_BYTES); // Write an empty array.
testGZIPCompressOnly0(BYTES_SMALL);
testGZIPCompressOnly0(BYTES_LARGE);
}
private void testGZIPCompressOnly0(byte[] data) throws IOException {
EmbeddedChannel chEncoder = new EmbeddedChannel(createEncoder(ZlibWrapper.GZIP));
if (data != null) {
chEncoder.writeOutbound(Unpooled.wrappedBuffer(data));
}
assertTrue(chEncoder.finish());
ByteBuf encoded = Unpooled.buffer();
for (;;) {
ByteBuf buf = chEncoder.readOutbound();
if (buf == null) {
break;
}
encoded.writeBytes(buf);
buf.release();
}
ByteBuf decoded = Unpooled.buffer();
GZIPInputStream stream = new GZIPInputStream(new ByteBufInputStream(encoded));
byte[] buf = new byte[8192];
for (;;) {
int readBytes = stream.read(buf);
if (readBytes < 0) {
break;
}
decoded.writeBytes(buf, 0, readBytes);
}
stream.close();
if (data != null) {
assertEquals(Unpooled.wrappedBuffer(data), decoded);
} else {
assertFalse(decoded.isReadable());
}
encoded.release();
decoded.release();
}
@Test
public void testZLIB_OR_NONE() throws Exception {
testCompressNone(ZlibWrapper.NONE, ZlibWrapper.ZLIB_OR_NONE);
testCompressSmall(ZlibWrapper.NONE, ZlibWrapper.ZLIB_OR_NONE);
testCompressLarge(ZlibWrapper.NONE, ZlibWrapper.ZLIB_OR_NONE);
}
@Test
public void testZLIB_OR_NONE2() throws Exception {
testCompressNone(ZlibWrapper.ZLIB, ZlibWrapper.ZLIB_OR_NONE);
testCompressSmall(ZlibWrapper.ZLIB, ZlibWrapper.ZLIB_OR_NONE);
testCompressLarge(ZlibWrapper.ZLIB, ZlibWrapper.ZLIB_OR_NONE);
}
@Test
public void testZLIB_OR_NONE3() throws Exception {
testCompressNone(ZlibWrapper.GZIP, ZlibWrapper.ZLIB_OR_NONE);
testCompressSmall(ZlibWrapper.GZIP, ZlibWrapper.ZLIB_OR_NONE);
testCompressLarge(ZlibWrapper.GZIP, ZlibWrapper.ZLIB_OR_NONE);
}
private static byte[] gzip(byte[] bytes) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
GZIPOutputStream stream = new GZIPOutputStream(out);
stream.write(bytes);
stream.close();
return out.toByteArray();
}
private static byte[] deflate(byte[] bytes) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
OutputStream stream = new DeflaterOutputStream(out);
stream.write(bytes);
stream.close();
return out.toByteArray();
}
}
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