42c65cca3a
- Move common methods from ByteBuf to Buf - Rename ensureWritableBytes() to ensureWritable() - Rename readable() to isReadable() - Rename writable() to isWritable() - Add isReadable(int) and isWritable(int) - Add AbstractMessageBuf - Rewrite DefaultMessageBuf and QueueBackedMessageBuf - based on Josh Bloch's public domain ArrayDeque impl
271 lines
9.1 KiB
Java
271 lines
9.1 KiB
Java
/*
|
|
* Copyright 2012 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.Unpooled;
|
|
import io.netty.channel.ChannelFuture;
|
|
import io.netty.channel.ChannelFutureListener;
|
|
import io.netty.channel.ChannelHandlerContext;
|
|
import io.netty.channel.ChannelPromise;
|
|
|
|
import java.util.concurrent.TimeUnit;
|
|
import java.util.concurrent.atomic.AtomicBoolean;
|
|
import java.util.zip.CRC32;
|
|
import java.util.zip.Deflater;
|
|
|
|
|
|
/**
|
|
* Compresses a {@link ByteBuf} using the deflate algorithm.
|
|
* @apiviz.landmark
|
|
* @apiviz.has org.jboss.netty.handler.codec.compression.ZlibWrapper
|
|
*/
|
|
public class JdkZlibEncoder extends ZlibEncoder {
|
|
|
|
private final byte[] encodeBuf = new byte[8192];
|
|
private final Deflater deflater;
|
|
private final AtomicBoolean finished = new AtomicBoolean();
|
|
private volatile ChannelHandlerContext ctx;
|
|
|
|
/*
|
|
* GZIP support
|
|
*/
|
|
private final boolean gzip;
|
|
private final CRC32 crc = new CRC32();
|
|
private static final byte[] gzipHeader = {0x1f, (byte) 0x8b, Deflater.DEFLATED, 0, 0, 0, 0, 0, 0, 0};
|
|
private boolean writeHeader = true;
|
|
|
|
/**
|
|
* Creates a new zlib encoder with the default compression level ({@code 6})
|
|
* and the default wrapper ({@link ZlibWrapper#ZLIB}).
|
|
*
|
|
* @throws CompressionException if failed to initialize zlib
|
|
*/
|
|
public JdkZlibEncoder() {
|
|
this(6);
|
|
}
|
|
|
|
/**
|
|
* Creates a new zlib encoder with the specified {@code compressionLevel}
|
|
* and the default wrapper ({@link ZlibWrapper#ZLIB}).
|
|
*
|
|
* @param compressionLevel
|
|
* {@code 1} yields the fastest compression and {@code 9} yields the
|
|
* best compression. {@code 0} means no compression. The default
|
|
* compression level is {@code 6}.
|
|
*
|
|
* @throws CompressionException if failed to initialize zlib
|
|
*/
|
|
public JdkZlibEncoder(int compressionLevel) {
|
|
this(ZlibWrapper.ZLIB, compressionLevel);
|
|
}
|
|
|
|
/**
|
|
* Creates a new zlib encoder with the default compression level ({@code 6})
|
|
* and the specified wrapper.
|
|
*
|
|
* @throws CompressionException if failed to initialize zlib
|
|
*/
|
|
public JdkZlibEncoder(ZlibWrapper wrapper) {
|
|
this(wrapper, 6);
|
|
}
|
|
|
|
/**
|
|
* Creates a new zlib encoder with the specified {@code compressionLevel}
|
|
* and the specified wrapper.
|
|
*
|
|
* @param compressionLevel
|
|
* {@code 1} yields the fastest compression and {@code 9} yields the
|
|
* best compression. {@code 0} means no compression. The default
|
|
* compression level is {@code 6}.
|
|
*
|
|
* @throws CompressionException if failed to initialize zlib
|
|
*/
|
|
public JdkZlibEncoder(ZlibWrapper wrapper, int compressionLevel) {
|
|
if (compressionLevel < 0 || compressionLevel > 9) {
|
|
throw new IllegalArgumentException(
|
|
"compressionLevel: " + compressionLevel + " (expected: 0-9)");
|
|
}
|
|
if (wrapper == null) {
|
|
throw new NullPointerException("wrapper");
|
|
}
|
|
if (wrapper == ZlibWrapper.ZLIB_OR_NONE) {
|
|
throw new IllegalArgumentException(
|
|
"wrapper '" + ZlibWrapper.ZLIB_OR_NONE + "' is not " +
|
|
"allowed for compression.");
|
|
}
|
|
|
|
gzip = wrapper == ZlibWrapper.GZIP;
|
|
deflater = new Deflater(compressionLevel, wrapper != ZlibWrapper.ZLIB);
|
|
}
|
|
|
|
/**
|
|
* Creates a new zlib encoder with the default compression level ({@code 6})
|
|
* and the specified preset dictionary. The wrapper is always
|
|
* {@link ZlibWrapper#ZLIB} because it is the only format that supports
|
|
* the preset dictionary.
|
|
*
|
|
* @param dictionary the preset dictionary
|
|
*
|
|
* @throws CompressionException if failed to initialize zlib
|
|
*/
|
|
public JdkZlibEncoder(byte[] dictionary) {
|
|
this(6, dictionary);
|
|
}
|
|
|
|
/**
|
|
* Creates a new zlib encoder with the specified {@code compressionLevel}
|
|
* and the specified preset dictionary. The wrapper is always
|
|
* {@link ZlibWrapper#ZLIB} because it is the only format that supports
|
|
* the preset dictionary.
|
|
*
|
|
* @param compressionLevel
|
|
* {@code 1} yields the fastest compression and {@code 9} yields the
|
|
* best compression. {@code 0} means no compression. The default
|
|
* compression level is {@code 6}.
|
|
* @param dictionary the preset dictionary
|
|
*
|
|
* @throws CompressionException if failed to initialize zlib
|
|
*/
|
|
public JdkZlibEncoder(int compressionLevel, byte[] dictionary) {
|
|
if (compressionLevel < 0 || compressionLevel > 9) {
|
|
throw new IllegalArgumentException(
|
|
"compressionLevel: " + compressionLevel + " (expected: 0-9)");
|
|
}
|
|
if (dictionary == null) {
|
|
throw new NullPointerException("dictionary");
|
|
}
|
|
|
|
gzip = false;
|
|
deflater = new Deflater(compressionLevel);
|
|
deflater.setDictionary(dictionary);
|
|
}
|
|
|
|
@Override
|
|
public ChannelFuture close() {
|
|
return close(ctx().newPromise());
|
|
}
|
|
|
|
@Override
|
|
public ChannelFuture close(ChannelPromise future) {
|
|
return finishEncode(ctx(), future);
|
|
}
|
|
|
|
private ChannelHandlerContext ctx() {
|
|
ChannelHandlerContext ctx = this.ctx;
|
|
if (ctx == null) {
|
|
throw new IllegalStateException("not added to a pipeline");
|
|
}
|
|
return ctx;
|
|
}
|
|
|
|
@Override
|
|
public boolean isClosed() {
|
|
return finished.get();
|
|
}
|
|
|
|
@Override
|
|
protected void encode(ChannelHandlerContext ctx, ByteBuf in, ByteBuf out) throws Exception {
|
|
if (finished.get()) {
|
|
out.writeBytes(in);
|
|
return;
|
|
}
|
|
|
|
ByteBuf uncompressed = in;
|
|
byte[] inAry = new byte[uncompressed.readableBytes()];
|
|
uncompressed.readBytes(inAry);
|
|
|
|
int sizeEstimate = (int) Math.ceil(inAry.length * 1.001) + 12;
|
|
out.ensureWritable(sizeEstimate);
|
|
|
|
synchronized (deflater) {
|
|
if (gzip) {
|
|
crc.update(inAry);
|
|
if (writeHeader) {
|
|
out.writeBytes(gzipHeader);
|
|
writeHeader = false;
|
|
}
|
|
}
|
|
|
|
deflater.setInput(inAry);
|
|
while (!deflater.needsInput()) {
|
|
int numBytes = deflater.deflate(encodeBuf, 0, encodeBuf.length, Deflater.SYNC_FLUSH);
|
|
out.writeBytes(encodeBuf, 0, numBytes);
|
|
}
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void close(final ChannelHandlerContext ctx, final ChannelPromise promise) throws Exception {
|
|
ChannelFuture f = finishEncode(ctx, ctx.newPromise());
|
|
f.addListener(new ChannelFutureListener() {
|
|
@Override
|
|
public void operationComplete(ChannelFuture f) throws Exception {
|
|
ctx.close(promise);
|
|
}
|
|
});
|
|
|
|
if (!f.isDone()) {
|
|
// Ensure the channel is closed even if the write operation completes in time.
|
|
ctx.executor().schedule(new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
ctx.close(promise);
|
|
}
|
|
}, 10, TimeUnit.SECONDS); // FIXME: Magic number
|
|
}
|
|
}
|
|
|
|
private ChannelFuture finishEncode(final ChannelHandlerContext ctx, ChannelPromise promise) {
|
|
if (!finished.compareAndSet(false, true)) {
|
|
promise.setSuccess();
|
|
return promise;
|
|
}
|
|
|
|
ByteBuf footer = Unpooled.buffer();
|
|
synchronized (deflater) {
|
|
deflater.finish();
|
|
while (!deflater.finished()) {
|
|
int numBytes = deflater.deflate(encodeBuf, 0, encodeBuf.length);
|
|
footer.writeBytes(encodeBuf, 0, numBytes);
|
|
}
|
|
if (gzip) {
|
|
int crcValue = (int) crc.getValue();
|
|
int uncBytes = deflater.getTotalIn();
|
|
footer.writeByte(crcValue);
|
|
footer.writeByte(crcValue >>> 8);
|
|
footer.writeByte(crcValue >>> 16);
|
|
footer.writeByte(crcValue >>> 24);
|
|
footer.writeByte(uncBytes);
|
|
footer.writeByte(uncBytes >>> 8);
|
|
footer.writeByte(uncBytes >>> 16);
|
|
footer.writeByte(uncBytes >>> 24);
|
|
}
|
|
deflater.end();
|
|
}
|
|
|
|
ctx.nextOutboundByteBuffer().writeBytes(footer);
|
|
ctx.flush(promise);
|
|
|
|
return promise;
|
|
}
|
|
|
|
@Override
|
|
public void beforeAdd(ChannelHandlerContext ctx) throws Exception {
|
|
this.ctx = ctx;
|
|
}
|
|
}
|