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Relates issue: NETTY-80 Compression codec

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* Initial implementation of jzlib based zlib compression handler
This commit is contained in:
Trustin Lee 2009-10-16 06:10:25 +00:00
parent 2b2d53ff62
commit a7132ee08e
6 changed files with 285 additions and 0 deletions
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8
NOTICE.txt
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@ -57,6 +57,14 @@ interchange format, which can be obtained at:
* HOMEPAGE:
* http://code.google.com/p/protobuf/
This product optionally depends on 'JZlib', a re-implementation of zlib in pure
Java, which can be obtained at:
* LICENSE:
* license/LICENSE.jzlib.txt (BSD Style License)
* HOMEPAGE:
* http://www.jcraft.com/jzlib/
This product optionally depends on 'SLF4J', a simple logging facade for Java,
which can be obtained at:

26
license/LICENSE.jzlib.txt Normal file
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@ -0,0 +1,26 @@
Copyright (c) 2000,2001,2002,2003,2004 ymnk, JCraft,Inc. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the distribution.
3. The names of the authors may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

9
pom.xml
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@ -77,6 +77,15 @@
<optional>true</optional>
</dependency>
<!-- JCraft JZlib - completely optional -->
<dependency>
<groupId>com.jcraft</groupId>
<artifactId>jzlib</artifactId>
<version>1.0.7</version>
<scope>compile</scope>
<optional>true</optional>
</dependency>
<!-- Servlet API - completely optional -->
<dependency>
<groupId>javax.servlet</groupId>

105
src/main/java/org/jboss/netty/handler/codec/compression/ZlibDecoder.java Normal file
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@ -0,0 +1,105 @@
/*
* Copyright 2009 Red Hat, Inc.
*
* Red Hat 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 org.jboss.netty.handler.codec.compression;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelPipelineCoverage;
import org.jboss.netty.handler.codec.oneone.OneToOneDecoder;
import com.jcraft.jzlib.JZlib;
import com.jcraft.jzlib.ZStream;
import com.jcraft.jzlib.ZStreamException;
/**
* Decompresses a {@link ChannelBuffer} using the deflate algorithm.
*
* @author The Netty Project (netty-dev@lists.jboss.org)
* @author Trustin Lee (tlee@redhat.com)
* @version $Rev$, $Date$
*/
@ChannelPipelineCoverage("one")
public class ZlibDecoder extends OneToOneDecoder {
private final ZStream z = new ZStream();
// TODO Auto-detect wrappers (zlib, gzip, nowrapper as a fallback)
/**
* Creates a new instance.
*/
public ZlibDecoder() {
z.inflateInit();
}
@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel, Object msg) throws Exception {
if (!(msg instanceof ChannelBuffer)) {
return msg;
}
try {
// Configure input.
ChannelBuffer compressed = (ChannelBuffer) msg;
byte[] in = new byte[compressed.readableBytes()];
compressed.readBytes(in);
z.next_in = in;
z.next_in_index = 0;
z.avail_in = in.length;
// Configure output.
byte[] out = new byte[in.length << 1];
ChannelBuffer decompressed = ChannelBuffers.dynamicBuffer(
compressed.order(), out.length,
ctx.getChannel().getConfig().getBufferFactory());
z.next_out = out;
z.next_out_index = 0;
z.avail_out = out.length;
do {
// Decompress 'in' into 'out'
int resultCode = z.inflate(JZlib.Z_SYNC_FLUSH);
switch (resultCode) {
case JZlib.Z_OK:
case JZlib.Z_BUF_ERROR:
decompressed.writeBytes(out, 0, z.next_out_index);
z.next_out_index = 0;
z.avail_out = out.length;
break;
default:
throw new ZStreamException(
"decompression failure (" + resultCode + ")" +
(z.msg != null? ": " + z.msg : ""));
}
} while (z.avail_in > 0);
if (decompressed.writerIndex() != 0) { // readerIndex is always 0
return decompressed;
} else {
return ChannelBuffers.EMPTY_BUFFER;
}
} finally {
// Deference the external references explicitly to tell the VM that
// the allocated byte arrays are temporary so that the call stack
// can be utilized.
// I'm not sure if the modern VMs do this optimization though.
z.next_in = null;
z.next_out = null;
}
}
}

111
src/main/java/org/jboss/netty/handler/codec/compression/ZlibEncoder.java Normal file
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@ -0,0 +1,111 @@
/*
* Copyright 2009 Red Hat, Inc.
*
* Red Hat 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 org.jboss.netty.handler.codec.compression;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelPipelineCoverage;
import org.jboss.netty.handler.codec.oneone.OneToOneEncoder;
import com.jcraft.jzlib.JZlib;
import com.jcraft.jzlib.ZStream;
import com.jcraft.jzlib.ZStreamException;
/**
* Compresses a {@link ChannelBuffer} using the deflate algorithm.
*
* @author The Netty Project (netty-dev@lists.jboss.org)
* @author Trustin Lee (tlee@redhat.com)
* @version $Rev$, $Date$
*/
@ChannelPipelineCoverage("one")
public class ZlibEncoder extends OneToOneEncoder {
private final ZStream z = new ZStream();
// TODO 'do not compress' once option
// TODO support three wrappers - zlib (default), gzip (unsupported by jzlib, but easy to implement), nowrap
/**
* Creates a new GZip encoder with the default compression level
* ({@link JZlib#Z_DEFAULT_COMPRESSION}).
*/
public ZlibEncoder() {
this(JZlib.Z_DEFAULT_COMPRESSION);
}
/**
* Creates a new GZip encoder with the specified {@code compressionLevel}.
*
* @param compressionLevel
* the compression level, as specified in {@link JZlib}.
* The common values are
* {@link JZlib#Z_BEST_COMPRESSION},
* {@link JZlib#Z_BEST_SPEED},
* {@link JZlib#Z_DEFAULT_COMPRESSION}, and
* {@link JZlib#Z_NO_COMPRESSION}.
*/
public ZlibEncoder(int compressionLevel) {
z.deflateInit(compressionLevel, false); // Default: ZLIB format
}
@Override
protected Object encode(ChannelHandlerContext ctx, Channel channel, Object msg) throws Exception {
if (!(msg instanceof ChannelBuffer)) {
return msg;
}
try {
// Configure input.
ChannelBuffer uncompressed = (ChannelBuffer) msg;
byte[] in = new byte[uncompressed.readableBytes()];
uncompressed.readBytes(in);
z.next_in = in;
z.next_in_index = 0;
z.avail_in = in.length;
// Configure output.
byte[] out = new byte[(int) Math.ceil(in.length * 1.001) + 12];
z.next_out = out;
z.next_out_index = 0;
z.avail_out = out.length;
// Note that Z_PARTIAL_FLUSH has been deprecated.
int resultCode = z.deflate(JZlib.Z_SYNC_FLUSH);
if (resultCode != JZlib.Z_OK) {
throw new ZStreamException(
"compression failure (" + resultCode + ")" +
(z.msg != null? ": " + z.msg : ""));
}
if (z.next_out_index != 0) {
return ctx.getChannel().getConfig().getBufferFactory().getBuffer(
uncompressed.order(), out, 0, z.next_out_index);
} else {
return ChannelBuffers.EMPTY_BUFFER;
}
} finally {
// Deference the external references explicitly to tell the VM that
// the allocated byte arrays are temporary so that the call stack
// can be utilized.
// I'm not sure if the modern VMs do this optimization though.
z.next_in = null;
z.next_out = null;
}
}
}

26
src/main/java/org/jboss/netty/handler/codec/compression/package-info.java Normal file
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@ -0,0 +1,26 @@
/*
* Copyright 2009 Red Hat, Inc.
*
* Red Hat 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.
*/
/**
* Encoder and decoder which compresses and decompresses {@link ChannelBuffer}s
* in a compression format such as <a href="http://en.wikipedia.org/wiki/Zlib">zlib</a>,
* <a href="http://en.wikipedia.org/wiki/Gzip">gzip</a>, and
* <a href="http://en.wikipedia.org/wiki/Bzip2">bzip2</a>.
*
* @apiviz.exclude \.codec\.(?!compression)[a-z0-9]+\.
*/
package org.jboss.netty.handler.codec.compression;
// TODO Implement bzip2 handlers