Forward-port JDK ZlibEncoder patch (#404)
- Rename ZlibEncoder/Decoder to JZlibEncoder/Decoder - Define a new ZlibEncoder/Decoder class - Add JdkZlibEncoder - All JZlib* and JdkZlib* extends ZlibEncoder/Decoder - Add ZlibCodecFactory and use it everywhere
This commit is contained in:
Trustin Lee
parent
7a4e374294
commit
32188f83ac
@ -16,7 +16,7 @@
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package io.netty.handler.codec.http;
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import io.netty.channel.embedded.EmbeddedByteChannel;
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import io.netty.handler.codec.compression.ZlibEncoder;
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import io.netty.handler.codec.compression.ZlibCodecFactory;
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import io.netty.handler.codec.compression.ZlibWrapper;
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/**
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@ -118,8 +118,8 @@ public class HttpContentCompressor extends HttpContentEncoder {
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return new Result(
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targetContentEncoding,
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new EmbeddedByteChannel(
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new ZlibEncoder(wrapper, compressionLevel, windowBits, memLevel)));
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new EmbeddedByteChannel(ZlibCodecFactory.newZlibEncoder(
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wrapper, compressionLevel, windowBits, memLevel)));
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}
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protected ZlibWrapper determineWrapper(String acceptEncoding) {
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@ -16,7 +16,7 @@
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package io.netty.handler.codec.http;
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import io.netty.channel.embedded.EmbeddedByteChannel;
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import io.netty.handler.codec.compression.ZlibDecoder;
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import io.netty.handler.codec.compression.ZlibCodecFactory;
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import io.netty.handler.codec.compression.ZlibWrapper;
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/**
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@ -28,10 +28,10 @@ public class HttpContentDecompressor extends HttpContentDecoder {
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@Override
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protected EmbeddedByteChannel newContentDecoder(String contentEncoding) throws Exception {
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if ("gzip".equalsIgnoreCase(contentEncoding) || "x-gzip".equalsIgnoreCase(contentEncoding)) {
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return new EmbeddedByteChannel(new ZlibDecoder(ZlibWrapper.GZIP));
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return new EmbeddedByteChannel(ZlibCodecFactory.newZlibDecoder(ZlibWrapper.GZIP));
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} else if ("deflate".equalsIgnoreCase(contentEncoding) || "x-deflate".equalsIgnoreCase(contentEncoding)) {
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// To be strict, 'deflate' means ZLIB, but some servers were not implemented correctly.
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return new EmbeddedByteChannel(new ZlibDecoder(ZlibWrapper.ZLIB_OR_NONE));
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return new EmbeddedByteChannel(ZlibCodecFactory.newZlibDecoder(ZlibWrapper.ZLIB_OR_NONE));
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}
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// 'identity' or unsupported
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@ -0,0 +1,178 @@
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/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.compression;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.util.internal.jzlib.JZlib;
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import io.netty.util.internal.jzlib.ZStream;
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public class JZlibDecoder extends ZlibDecoder {
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private final ZStream z = new ZStream();
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private byte[] dictionary;
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private volatile boolean finished;
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/**
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* Creates a new instance with the default wrapper ({@link ZlibWrapper#ZLIB}).
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*
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* @throws CompressionException if failed to initialize zlib
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*/
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public JZlibDecoder() {
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this(ZlibWrapper.ZLIB);
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}
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/**
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* Creates a new instance with the specified wrapper.
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*
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* @throws CompressionException if failed to initialize zlib
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*/
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public JZlibDecoder(ZlibWrapper wrapper) {
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if (wrapper == null) {
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throw new NullPointerException("wrapper");
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}
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int resultCode = z.inflateInit(ZlibUtil.convertWrapperType(wrapper));
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if (resultCode != JZlib.Z_OK) {
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ZlibUtil.fail(z, "initialization failure", resultCode);
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}
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}
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/**
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* Creates a new instance with the specified preset dictionary. The wrapper
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* is always {@link ZlibWrapper#ZLIB} because it is the only format that
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* supports the preset dictionary.
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*
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* @throws CompressionException if failed to initialize zlib
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*/
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public JZlibDecoder(byte[] dictionary) {
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if (dictionary == null) {
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throw new NullPointerException("dictionary");
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}
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this.dictionary = dictionary;
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int resultCode;
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resultCode = z.inflateInit(JZlib.W_ZLIB);
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if (resultCode != JZlib.Z_OK) {
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ZlibUtil.fail(z, "initialization failure", resultCode);
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}
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}
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/**
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* Returns {@code true} if and only if the end of the compressed stream
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* has been reached.
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*/
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@Override
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public boolean isClosed() {
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return finished;
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}
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@Override
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public void decode(
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ChannelHandlerContext ctx,
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ByteBuf in, ByteBuf out) throws Exception {
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if (!in.readable()) {
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return;
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}
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try {
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// Configure input.
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int inputLength = in.readableBytes();
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boolean inHasArray = in.hasArray();
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z.avail_in = inputLength;
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if (inHasArray) {
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z.next_in = in.array();
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z.next_in_index = in.arrayOffset() + in.readerIndex();
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} else {
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byte[] array = new byte[inputLength];
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in.readBytes(array);
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z.next_in = array;
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z.next_in_index = 0;
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}
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int oldNextInIndex = z.next_in_index;
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// Configure output.
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int maxOutputLength = inputLength << 1;
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boolean outHasArray = out.hasArray();
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if (!outHasArray) {
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z.next_out = new byte[maxOutputLength];
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}
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try {
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loop: for (;;) {
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z.avail_out = maxOutputLength;
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if (outHasArray) {
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out.ensureWritableBytes(maxOutputLength);
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z.next_out = out.array();
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z.next_out_index = out.arrayOffset() + out.writerIndex();
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} else {
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z.next_out_index = 0;
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}
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int oldNextOutIndex = z.next_out_index;
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// Decompress 'in' into 'out'
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int resultCode = z.inflate(JZlib.Z_SYNC_FLUSH);
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int outputLength = z.next_out_index - oldNextOutIndex;
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if (outputLength > 0) {
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if (outHasArray) {
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out.writerIndex(out.writerIndex() + outputLength);
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} else {
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out.writeBytes(z.next_out, 0, outputLength);
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}
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}
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switch (resultCode) {
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case JZlib.Z_NEED_DICT:
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if (dictionary == null) {
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ZlibUtil.fail(z, "decompression failure", resultCode);
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} else {
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resultCode = z.inflateSetDictionary(dictionary, dictionary.length);
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if (resultCode != JZlib.Z_OK) {
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ZlibUtil.fail(z, "failed to set the dictionary", resultCode);
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}
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}
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break;
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case JZlib.Z_STREAM_END:
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finished = true; // Do not decode anymore.
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z.inflateEnd();
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break loop;
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case JZlib.Z_OK:
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break;
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case JZlib.Z_BUF_ERROR:
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if (z.avail_in <= 0) {
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break loop;
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}
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break;
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default:
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ZlibUtil.fail(z, "decompression failure", resultCode);
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}
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}
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} finally {
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if (inHasArray) {
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in.skipBytes(z.next_in_index - oldNextInIndex);
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}
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}
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} finally {
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// Deference the external references explicitly to tell the VM that
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// the allocated byte arrays are temporary so that the call stack
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// can be utilized.
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// I'm not sure if the modern VMs do this optimization though.
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z.next_in = null;
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z.next_out = null;
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}
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}
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}
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@ -0,0 +1,434 @@
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/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.compression;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.Unpooled;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.util.internal.jzlib.JZlib;
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import io.netty.util.internal.jzlib.ZStream;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.AtomicBoolean;
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/**
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* Compresses a {@link ByteBuf} using the deflate algorithm.
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* @apiviz.landmark
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* @apiviz.has io.netty.handler.codec.compression.ZlibWrapper
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*/
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public class JZlibEncoder extends ZlibEncoder {
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private static final byte[] EMPTY_ARRAY = new byte[0];
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private final ZStream z = new ZStream();
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private final AtomicBoolean finished = new AtomicBoolean();
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private volatile ChannelHandlerContext ctx;
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/**
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* Creates a new zlib encoder with the default compression level ({@code 6}),
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* default window bits ({@code 15}), default memory level ({@code 8}),
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* and the default wrapper ({@link ZlibWrapper#ZLIB}).
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*
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* @throws CompressionException if failed to initialize zlib
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*/
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public JZlibEncoder() {
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this(6);
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}
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/**
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* Creates a new zlib encoder with the specified {@code compressionLevel},
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* default window bits ({@code 15}), default memory level ({@code 8}),
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* and the default wrapper ({@link ZlibWrapper#ZLIB}).
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*
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* @param compressionLevel
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* {@code 1} yields the fastest compression and {@code 9} yields the
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* best compression. {@code 0} means no compression. The default
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* compression level is {@code 6}.
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*
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* @throws CompressionException if failed to initialize zlib
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*/
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public JZlibEncoder(int compressionLevel) {
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this(ZlibWrapper.ZLIB, compressionLevel);
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}
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/**
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* Creates a new zlib encoder with the default compression level ({@code 6}),
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* default window bits ({@code 15}), default memory level ({@code 8}),
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* and the specified wrapper.
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*
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* @throws CompressionException if failed to initialize zlib
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*/
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public JZlibEncoder(ZlibWrapper wrapper) {
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this(wrapper, 6);
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}
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/**
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* Creates a new zlib encoder with the specified {@code compressionLevel},
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* default window bits ({@code 15}), default memory level ({@code 8}),
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* and the specified wrapper.
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*
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* @param compressionLevel
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* {@code 1} yields the fastest compression and {@code 9} yields the
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* best compression. {@code 0} means no compression. The default
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* compression level is {@code 6}.
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*
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* @throws CompressionException if failed to initialize zlib
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*/
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public JZlibEncoder(ZlibWrapper wrapper, int compressionLevel) {
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this(wrapper, compressionLevel, 15, 8);
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}
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/**
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* Creates a new zlib encoder with the specified {@code compressionLevel},
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* the specified {@code windowBits}, the specified {@code memLevel}, and
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* the specified wrapper.
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*
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* @param compressionLevel
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* {@code 1} yields the fastest compression and {@code 9} yields the
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* best compression. {@code 0} means no compression. The default
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* compression level is {@code 6}.
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* @param windowBits
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* The base two logarithm of the size of the history buffer. The
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* value should be in the range {@code 9} to {@code 15} inclusive.
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* Larger values result in better compression at the expense of
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* memory usage. The default value is {@code 15}.
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* @param memLevel
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* How much memory should be allocated for the internal compression
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* state. {@code 1} uses minimum memory and {@code 9} uses maximum
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* memory. Larger values result in better and faster compression
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* at the expense of memory usage. The default value is {@code 8}
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*
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* @throws CompressionException if failed to initialize zlib
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*/
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public JZlibEncoder(ZlibWrapper wrapper, int compressionLevel, int windowBits, int memLevel) {
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if (compressionLevel < 0 || compressionLevel > 9) {
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throw new IllegalArgumentException(
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"compressionLevel: " + compressionLevel +
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" (expected: 0-9)");
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}
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if (windowBits < 9 || windowBits > 15) {
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throw new IllegalArgumentException(
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"windowBits: " + windowBits + " (expected: 9-15)");
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}
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if (memLevel < 1 || memLevel > 9) {
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throw new IllegalArgumentException(
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"memLevel: " + memLevel + " (expected: 1-9)");
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}
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if (wrapper == null) {
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throw new NullPointerException("wrapper");
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}
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if (wrapper == ZlibWrapper.ZLIB_OR_NONE) {
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throw new IllegalArgumentException(
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"wrapper '" + ZlibWrapper.ZLIB_OR_NONE + "' is not " +
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"allowed for compression.");
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}
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synchronized (z) {
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int resultCode = z.deflateInit(
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compressionLevel, windowBits, memLevel,
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ZlibUtil.convertWrapperType(wrapper));
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if (resultCode != JZlib.Z_OK) {
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ZlibUtil.fail(z, "initialization failure", resultCode);
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}
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}
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}
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/**
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* Creates a new zlib encoder with the default compression level ({@code 6}),
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* default window bits ({@code 15}), default memory level ({@code 8}),
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* and the specified preset dictionary. The wrapper is always
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* {@link ZlibWrapper#ZLIB} because it is the only format that supports
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* the preset dictionary.
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*
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* @param dictionary the preset dictionary
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*
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* @throws CompressionException if failed to initialize zlib
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*/
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public JZlibEncoder(byte[] dictionary) {
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this(6, dictionary);
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}
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/**
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* Creates a new zlib encoder with the specified {@code compressionLevel},
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* default window bits ({@code 15}), default memory level ({@code 8}),
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* and the specified preset dictionary. The wrapper is always
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* {@link ZlibWrapper#ZLIB} because it is the only format that supports
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* the preset dictionary.
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*
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* @param compressionLevel
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* {@code 1} yields the fastest compression and {@code 9} yields the
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* best compression. {@code 0} means no compression. The default
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* compression level is {@code 6}.
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* @param dictionary the preset dictionary
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*
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* @throws CompressionException if failed to initialize zlib
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*/
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public JZlibEncoder(int compressionLevel, byte[] dictionary) {
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this(compressionLevel, 15, 8, dictionary);
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}
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/**
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* Creates a new zlib encoder with the specified {@code compressionLevel},
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* the specified {@code windowBits}, the specified {@code memLevel},
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* and the specified preset dictionary. The wrapper is always
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* {@link ZlibWrapper#ZLIB} because it is the only format that supports
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* the preset dictionary.
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*
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* @param compressionLevel
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* {@code 1} yields the fastest compression and {@code 9} yields the
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* best compression. {@code 0} means no compression. The default
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* compression level is {@code 6}.
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* @param windowBits
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* The base two logarithm of the size of the history buffer. The
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* value should be in the range {@code 9} to {@code 15} inclusive.
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* Larger values result in better compression at the expense of
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* memory usage. The default value is {@code 15}.
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* @param memLevel
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* How much memory should be allocated for the internal compression
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* state. {@code 1} uses minimum memory and {@code 9} uses maximum
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* memory. Larger values result in better and faster compression
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* at the expense of memory usage. The default value is {@code 8}
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* @param dictionary the preset dictionary
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*
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* @throws CompressionException if failed to initialize zlib
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*/
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public JZlibEncoder(int compressionLevel, int windowBits, int memLevel, byte[] dictionary) {
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if (compressionLevel < 0 || compressionLevel > 9) {
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throw new IllegalArgumentException("compressionLevel: " + compressionLevel + " (expected: 0-9)");
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}
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if (windowBits < 9 || windowBits > 15) {
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throw new IllegalArgumentException(
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"windowBits: " + windowBits + " (expected: 9-15)");
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}
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if (memLevel < 1 || memLevel > 9) {
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throw new IllegalArgumentException(
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"memLevel: " + memLevel + " (expected: 1-9)");
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}
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if (dictionary == null) {
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throw new NullPointerException("dictionary");
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}
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synchronized (z) {
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int resultCode;
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resultCode = z.deflateInit(
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compressionLevel, windowBits, memLevel,
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JZlib.W_ZLIB); // Default: ZLIB format
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if (resultCode != JZlib.Z_OK) {
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ZlibUtil.fail(z, "initialization failure", resultCode);
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} else {
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resultCode = z.deflateSetDictionary(dictionary, dictionary.length);
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if (resultCode != JZlib.Z_OK) {
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ZlibUtil.fail(z, "failed to set the dictionary", resultCode);
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}
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}
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}
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}
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@Override
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public ChannelFuture close() {
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return close(ctx().channel().newFuture());
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}
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@Override
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public ChannelFuture close(ChannelFuture future) {
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return finishEncode(ctx(), future);
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||||
}
|
||||
|
||||
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
|
||||
public void encode(ChannelHandlerContext ctx,
|
||||
ByteBuf in, ByteBuf out) throws Exception {
|
||||
if (finished.get()) {
|
||||
return;
|
||||
}
|
||||
|
||||
synchronized (z) {
|
||||
try {
|
||||
// Configure input.
|
||||
int inputLength = in.readableBytes();
|
||||
boolean inHasArray = in.hasArray();
|
||||
z.avail_in = inputLength;
|
||||
if (inHasArray) {
|
||||
z.next_in = in.array();
|
||||
z.next_in_index = in.arrayOffset() + in.readerIndex();
|
||||
} else {
|
||||
byte[] array = new byte[inputLength];
|
||||
in.readBytes(array);
|
||||
z.next_in = array;
|
||||
z.next_in_index = 0;
|
||||
}
|
||||
int oldNextInIndex = z.next_in_index;
|
||||
|
||||
// Configure output.
|
||||
int maxOutputLength = (int) Math.ceil(inputLength * 1.001) + 12;
|
||||
boolean outHasArray = out.hasArray();
|
||||
z.avail_out = maxOutputLength;
|
||||
if (outHasArray) {
|
||||
out.ensureWritableBytes(maxOutputLength);
|
||||
z.next_out = out.array();
|
||||
z.next_out_index = out.arrayOffset() + out.writerIndex();
|
||||
} else {
|
||||
z.next_out = new byte[maxOutputLength];
|
||||
z.next_out_index = 0;
|
||||
}
|
||||
int oldNextOutIndex = z.next_out_index;
|
||||
|
||||
// Note that Z_PARTIAL_FLUSH has been deprecated.
|
||||
int resultCode;
|
||||
try {
|
||||
resultCode = z.deflate(JZlib.Z_SYNC_FLUSH);
|
||||
} finally {
|
||||
if (inHasArray) {
|
||||
in.skipBytes(z.next_in_index - oldNextInIndex);
|
||||
}
|
||||
}
|
||||
|
||||
if (resultCode != JZlib.Z_OK) {
|
||||
ZlibUtil.fail(z, "compression failure", resultCode);
|
||||
}
|
||||
|
||||
int outputLength = z.next_out_index - oldNextOutIndex;
|
||||
if (outputLength > 0) {
|
||||
if (outHasArray) {
|
||||
out.writerIndex(out.writerIndex() + outputLength);
|
||||
} else {
|
||||
out.writeBytes(z.next_out, 0, outputLength);
|
||||
}
|
||||
}
|
||||
} 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;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public void disconnect(
|
||||
final ChannelHandlerContext ctx,
|
||||
final ChannelFuture future) throws Exception {
|
||||
ChannelFuture f = finishEncode(ctx, ctx.newFuture());
|
||||
f.addListener(new ChannelFutureListener() {
|
||||
@Override
|
||||
public void operationComplete(ChannelFuture f) throws Exception {
|
||||
ctx.disconnect(future);
|
||||
}
|
||||
});
|
||||
|
||||
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.disconnect(future);
|
||||
}
|
||||
}, 10, TimeUnit.SECONDS); // FIXME: Magic number
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public void close(
|
||||
final ChannelHandlerContext ctx,
|
||||
final ChannelFuture future) throws Exception {
|
||||
ChannelFuture f = finishEncode(ctx, ctx.newFuture());
|
||||
f.addListener(new ChannelFutureListener() {
|
||||
@Override
|
||||
public void operationComplete(ChannelFuture f) throws Exception {
|
||||
ctx.close(future);
|
||||
}
|
||||
});
|
||||
|
||||
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(future);
|
||||
}
|
||||
}, 10, TimeUnit.SECONDS); // FIXME: Magic number
|
||||
}
|
||||
}
|
||||
|
||||
private ChannelFuture finishEncode(ChannelHandlerContext ctx, ChannelFuture future) {
|
||||
if (!finished.compareAndSet(false, true)) {
|
||||
future.setSuccess();
|
||||
return future;
|
||||
}
|
||||
|
||||
ByteBuf footer;
|
||||
synchronized (z) {
|
||||
try {
|
||||
// Configure input.
|
||||
z.next_in = EMPTY_ARRAY;
|
||||
z.next_in_index = 0;
|
||||
z.avail_in = 0;
|
||||
|
||||
// Configure output.
|
||||
byte[] out = new byte[32]; // room for ADLER32 + ZLIB / CRC32 + GZIP header
|
||||
z.next_out = out;
|
||||
z.next_out_index = 0;
|
||||
z.avail_out = out.length;
|
||||
|
||||
// Write the ADLER32 checksum (stream footer).
|
||||
int resultCode = z.deflate(JZlib.Z_FINISH);
|
||||
if (resultCode != JZlib.Z_OK && resultCode != JZlib.Z_STREAM_END) {
|
||||
future.setFailure(ZlibUtil.exception(z, "compression failure", resultCode));
|
||||
return future;
|
||||
} else if (z.next_out_index != 0) {
|
||||
footer = Unpooled.wrappedBuffer(out, 0, z.next_out_index);
|
||||
} else {
|
||||
footer = Unpooled.EMPTY_BUFFER;
|
||||
}
|
||||
} finally {
|
||||
z.deflateEnd();
|
||||
|
||||
// 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;
|
||||
}
|
||||
}
|
||||
|
||||
ctx.write(footer, future);
|
||||
return future;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void beforeAdd(ChannelHandlerContext ctx) throws Exception {
|
||||
this.ctx = ctx;
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,296 @@
|
||||
/*
|
||||
* 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 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().newFuture());
|
||||
}
|
||||
|
||||
@Override
|
||||
public ChannelFuture close(ChannelFuture 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
|
||||
public void encode(ChannelHandlerContext ctx, ByteBuf in, ByteBuf out) throws Exception {
|
||||
if (finished.get()) {
|
||||
out.writeBytes(in);
|
||||
in.discardReadBytes();
|
||||
return;
|
||||
}
|
||||
|
||||
ByteBuf uncompressed = in;
|
||||
byte[] inAry = new byte[uncompressed.readableBytes()];
|
||||
uncompressed.readBytes(inAry);
|
||||
|
||||
int sizeEstimate = (int) Math.ceil(inAry.length * 1.001) + 12;
|
||||
out.ensureWritableBytes(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 disconnect(final ChannelHandlerContext ctx, final ChannelFuture future) throws Exception {
|
||||
ChannelFuture f = finishEncode(ctx, ctx.newFuture());
|
||||
f.addListener(new ChannelFutureListener() {
|
||||
@Override
|
||||
public void operationComplete(ChannelFuture f) throws Exception {
|
||||
ctx.disconnect(future);
|
||||
}
|
||||
});
|
||||
|
||||
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.disconnect(future);
|
||||
}
|
||||
}, 10, TimeUnit.SECONDS); // FIXME: Magic number
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public void close(final ChannelHandlerContext ctx, final ChannelFuture future) throws Exception {
|
||||
ChannelFuture f = finishEncode(ctx, ctx.newFuture());
|
||||
f.addListener(new ChannelFutureListener() {
|
||||
@Override
|
||||
public void operationComplete(ChannelFuture f) throws Exception {
|
||||
ctx.close(future);
|
||||
}
|
||||
});
|
||||
|
||||
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(future);
|
||||
}
|
||||
}, 10, TimeUnit.SECONDS); // FIXME: Magic number
|
||||
}
|
||||
}
|
||||
|
||||
private ChannelFuture finishEncode(final ChannelHandlerContext ctx, ChannelFuture future) {
|
||||
if (!finished.compareAndSet(false, true)) {
|
||||
future.setSuccess();
|
||||
return future;
|
||||
}
|
||||
|
||||
ByteBuf footer = Unpooled.EMPTY_BUFFER;
|
||||
synchronized (deflater) {
|
||||
int numBytes = 0;
|
||||
deflater.finish();
|
||||
if (!deflater.finished()) {
|
||||
numBytes = deflater.deflate(encodeBuf, 0, encodeBuf.length);
|
||||
}
|
||||
int footerSize = gzip ? numBytes + 8 : numBytes;
|
||||
if (footerSize > 0) {
|
||||
footer = Unpooled.buffer(footerSize);
|
||||
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(future);
|
||||
|
||||
return future;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void beforeAdd(ChannelHandlerContext ctx) throws Exception {
|
||||
this.ctx = ctx;
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,96 @@
|
||||
/*
|
||||
* 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.util.internal.DetectionUtil;
|
||||
|
||||
/**
|
||||
* Creates a new {@link ZlibEncoder} and a new {@link ZlibDecoder}.
|
||||
*/
|
||||
public final class ZlibCodecFactory {
|
||||
|
||||
public static ZlibEncoder newZlibEncoder(int compressionLevel) {
|
||||
if (DetectionUtil.javaVersion() < 7) {
|
||||
return new JZlibEncoder(compressionLevel);
|
||||
} else {
|
||||
return new JdkZlibEncoder(compressionLevel);
|
||||
}
|
||||
}
|
||||
|
||||
public static ZlibEncoder newZlibEncoder(ZlibWrapper wrapper) {
|
||||
if (DetectionUtil.javaVersion() < 7) {
|
||||
return new JZlibEncoder(wrapper);
|
||||
} else {
|
||||
return new JdkZlibEncoder(wrapper);
|
||||
}
|
||||
}
|
||||
|
||||
public static ZlibEncoder newZlibEncoder(ZlibWrapper wrapper, int compressionLevel) {
|
||||
if (DetectionUtil.javaVersion() < 7) {
|
||||
return new JZlibEncoder(wrapper, compressionLevel);
|
||||
} else {
|
||||
return new JdkZlibEncoder(wrapper, compressionLevel);
|
||||
}
|
||||
}
|
||||
|
||||
public static ZlibEncoder newZlibEncoder(ZlibWrapper wrapper, int compressionLevel, int windowBits, int memLevel) {
|
||||
if (DetectionUtil.javaVersion() < 7) {
|
||||
return new JZlibEncoder(wrapper, compressionLevel, windowBits, memLevel);
|
||||
} else {
|
||||
return new JdkZlibEncoder(wrapper, compressionLevel);
|
||||
}
|
||||
}
|
||||
|
||||
public static ZlibEncoder newZlibEncoder(byte[] dictionary) {
|
||||
if (DetectionUtil.javaVersion() < 7) {
|
||||
return new JZlibEncoder(dictionary);
|
||||
} else {
|
||||
return new JdkZlibEncoder(dictionary);
|
||||
}
|
||||
}
|
||||
|
||||
public static ZlibEncoder newZlibEncoder(int compressionLevel, byte[] dictionary) {
|
||||
if (DetectionUtil.javaVersion() < 7) {
|
||||
return new JZlibEncoder(compressionLevel, dictionary);
|
||||
} else {
|
||||
return new JdkZlibEncoder(compressionLevel, dictionary);
|
||||
}
|
||||
}
|
||||
|
||||
public static ZlibEncoder newZlibEncoder(int compressionLevel, int windowBits, int memLevel, byte[] dictionary) {
|
||||
if (DetectionUtil.javaVersion() < 7) {
|
||||
return new JZlibEncoder(compressionLevel, windowBits, memLevel, dictionary);
|
||||
} else {
|
||||
return new JdkZlibEncoder(compressionLevel, dictionary);
|
||||
}
|
||||
}
|
||||
|
||||
public static ZlibDecoder newZlibDecoder() {
|
||||
return new JZlibDecoder();
|
||||
}
|
||||
|
||||
public static ZlibDecoder newZlibDecoder(ZlibWrapper wrapper) {
|
||||
return new JZlibDecoder(wrapper);
|
||||
}
|
||||
|
||||
public static ZlibDecoder newZlibDecoder(byte[] dictionary) {
|
||||
return new JZlibDecoder(dictionary);
|
||||
}
|
||||
|
||||
private ZlibCodecFactory() {
|
||||
// Unused
|
||||
}
|
||||
}
|
||||
@ -16,169 +16,19 @@
|
||||
package io.netty.handler.codec.compression;
|
||||
|
||||
import io.netty.buffer.ByteBuf;
|
||||
import io.netty.channel.ChannelHandlerContext;
|
||||
import io.netty.handler.codec.ByteToByteDecoder;
|
||||
import io.netty.util.internal.jzlib.JZlib;
|
||||
import io.netty.util.internal.jzlib.ZStream;
|
||||
|
||||
|
||||
/**
|
||||
* Decompresses a {@link ByteBuf} using the deflate algorithm.
|
||||
*
|
||||
* @apiviz.landmark
|
||||
* @apiviz.has io.netty.handler.codec.compression.ZlibWrapper
|
||||
*/
|
||||
public class ZlibDecoder extends ByteToByteDecoder {
|
||||
|
||||
private final ZStream z = new ZStream();
|
||||
private byte[] dictionary;
|
||||
private volatile boolean finished;
|
||||
|
||||
/**
|
||||
* Creates a new instance with the default wrapper ({@link ZlibWrapper#ZLIB}).
|
||||
*
|
||||
* @throws CompressionException if failed to initialize zlib
|
||||
*/
|
||||
public ZlibDecoder() {
|
||||
this(ZlibWrapper.ZLIB);
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a new instance with the specified wrapper.
|
||||
*
|
||||
* @throws CompressionException if failed to initialize zlib
|
||||
*/
|
||||
public ZlibDecoder(ZlibWrapper wrapper) {
|
||||
if (wrapper == null) {
|
||||
throw new NullPointerException("wrapper");
|
||||
}
|
||||
|
||||
int resultCode = z.inflateInit(ZlibUtil.convertWrapperType(wrapper));
|
||||
if (resultCode != JZlib.Z_OK) {
|
||||
ZlibUtil.fail(z, "initialization failure", resultCode);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a new instance with the specified preset dictionary. The wrapper
|
||||
* is always {@link ZlibWrapper#ZLIB} because it is the only format that
|
||||
* supports the preset dictionary.
|
||||
*
|
||||
* @throws CompressionException if failed to initialize zlib
|
||||
*/
|
||||
public ZlibDecoder(byte[] dictionary) {
|
||||
if (dictionary == null) {
|
||||
throw new NullPointerException("dictionary");
|
||||
}
|
||||
this.dictionary = dictionary;
|
||||
|
||||
int resultCode;
|
||||
resultCode = z.inflateInit(JZlib.W_ZLIB);
|
||||
if (resultCode != JZlib.Z_OK) {
|
||||
ZlibUtil.fail(z, "initialization failure", resultCode);
|
||||
}
|
||||
}
|
||||
public abstract class ZlibDecoder extends ByteToByteDecoder {
|
||||
|
||||
/**
|
||||
* Returns {@code true} if and only if the end of the compressed stream
|
||||
* has been reached.
|
||||
*/
|
||||
public boolean isClosed() {
|
||||
return finished;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void decode(
|
||||
ChannelHandlerContext ctx,
|
||||
ByteBuf in, ByteBuf out) throws Exception {
|
||||
|
||||
if (!in.readable()) {
|
||||
return;
|
||||
}
|
||||
|
||||
try {
|
||||
// Configure input.
|
||||
int inputLength = in.readableBytes();
|
||||
boolean inHasArray = in.hasArray();
|
||||
z.avail_in = inputLength;
|
||||
if (inHasArray) {
|
||||
z.next_in = in.array();
|
||||
z.next_in_index = in.arrayOffset() + in.readerIndex();
|
||||
} else {
|
||||
byte[] array = new byte[inputLength];
|
||||
in.readBytes(array);
|
||||
z.next_in = array;
|
||||
z.next_in_index = 0;
|
||||
}
|
||||
int oldNextInIndex = z.next_in_index;
|
||||
|
||||
// Configure output.
|
||||
int maxOutputLength = inputLength << 1;
|
||||
boolean outHasArray = out.hasArray();
|
||||
if (!outHasArray) {
|
||||
z.next_out = new byte[maxOutputLength];
|
||||
}
|
||||
|
||||
try {
|
||||
loop: for (;;) {
|
||||
z.avail_out = maxOutputLength;
|
||||
if (outHasArray) {
|
||||
out.ensureWritableBytes(maxOutputLength);
|
||||
z.next_out = out.array();
|
||||
z.next_out_index = out.arrayOffset() + out.writerIndex();
|
||||
} else {
|
||||
z.next_out_index = 0;
|
||||
}
|
||||
int oldNextOutIndex = z.next_out_index;
|
||||
|
||||
// Decompress 'in' into 'out'
|
||||
int resultCode = z.inflate(JZlib.Z_SYNC_FLUSH);
|
||||
int outputLength = z.next_out_index - oldNextOutIndex;
|
||||
if (outputLength > 0) {
|
||||
if (outHasArray) {
|
||||
out.writerIndex(out.writerIndex() + outputLength);
|
||||
} else {
|
||||
out.writeBytes(z.next_out, 0, outputLength);
|
||||
}
|
||||
}
|
||||
|
||||
switch (resultCode) {
|
||||
case JZlib.Z_NEED_DICT:
|
||||
if (dictionary == null) {
|
||||
ZlibUtil.fail(z, "decompression failure", resultCode);
|
||||
} else {
|
||||
resultCode = z.inflateSetDictionary(dictionary, dictionary.length);
|
||||
if (resultCode != JZlib.Z_OK) {
|
||||
ZlibUtil.fail(z, "failed to set the dictionary", resultCode);
|
||||
}
|
||||
}
|
||||
break;
|
||||
case JZlib.Z_STREAM_END:
|
||||
finished = true; // Do not decode anymore.
|
||||
z.inflateEnd();
|
||||
break loop;
|
||||
case JZlib.Z_OK:
|
||||
break;
|
||||
case JZlib.Z_BUF_ERROR:
|
||||
if (z.avail_in <= 0) {
|
||||
break loop;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
ZlibUtil.fail(z, "decompression failure", resultCode);
|
||||
}
|
||||
}
|
||||
} finally {
|
||||
if (inHasArray) {
|
||||
in.skipBytes(z.next_in_index - oldNextInIndex);
|
||||
}
|
||||
}
|
||||
} 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;
|
||||
}
|
||||
}
|
||||
public abstract boolean isClosed();
|
||||
}
|
||||
|
||||
@ -16,394 +16,25 @@
|
||||
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.handler.codec.ByteToByteEncoder;
|
||||
import io.netty.util.internal.jzlib.JZlib;
|
||||
import io.netty.util.internal.jzlib.ZStream;
|
||||
|
||||
import java.util.concurrent.atomic.AtomicBoolean;
|
||||
|
||||
|
||||
/**
|
||||
* Compresses a {@link ByteBuf} using the deflate algorithm.
|
||||
* Decompresses a {@link ByteBuf} using the deflate algorithm.
|
||||
*
|
||||
* @apiviz.landmark
|
||||
* @apiviz.has io.netty.handler.codec.compression.ZlibWrapper
|
||||
*/
|
||||
public class ZlibEncoder extends ByteToByteEncoder {
|
||||
|
||||
private static final byte[] EMPTY_ARRAY = new byte[0];
|
||||
|
||||
private final ZStream z = new ZStream();
|
||||
private final AtomicBoolean finished = new AtomicBoolean();
|
||||
private volatile ChannelHandlerContext ctx;
|
||||
public abstract class ZlibEncoder extends ByteToByteEncoder {
|
||||
|
||||
/**
|
||||
* Creates a new zlib encoder with the default compression level ({@code 6}),
|
||||
* default window bits ({@code 15}), default memory level ({@code 8}),
|
||||
* and the default wrapper ({@link ZlibWrapper#ZLIB}).
|
||||
*
|
||||
* @throws CompressionException if failed to initialize zlib
|
||||
* Returns {@code true} if and only if the end of the compressed stream
|
||||
* has been reached.
|
||||
*/
|
||||
public ZlibEncoder() {
|
||||
this(6);
|
||||
}
|
||||
public abstract boolean isClosed();
|
||||
|
||||
/**
|
||||
* Creates a new zlib encoder with the specified {@code compressionLevel},
|
||||
* default window bits ({@code 15}), default memory level ({@code 8}),
|
||||
* 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 ZlibEncoder(int compressionLevel) {
|
||||
this(ZlibWrapper.ZLIB, compressionLevel);
|
||||
}
|
||||
public abstract ChannelFuture close();
|
||||
|
||||
/**
|
||||
* Creates a new zlib encoder with the default compression level ({@code 6}),
|
||||
* default window bits ({@code 15}), default memory level ({@code 8}),
|
||||
* and the specified wrapper.
|
||||
*
|
||||
* @throws CompressionException if failed to initialize zlib
|
||||
*/
|
||||
public ZlibEncoder(ZlibWrapper wrapper) {
|
||||
this(wrapper, 6);
|
||||
}
|
||||
public abstract ChannelFuture close(ChannelFuture future);
|
||||
|
||||
/**
|
||||
* Creates a new zlib encoder with the specified {@code compressionLevel},
|
||||
* default window bits ({@code 15}), default memory level ({@code 8}),
|
||||
* 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 ZlibEncoder(ZlibWrapper wrapper, int compressionLevel) {
|
||||
this(wrapper, compressionLevel, 15, 8);
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a new zlib encoder with the specified {@code compressionLevel},
|
||||
* the specified {@code windowBits}, the specified {@code memLevel}, 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}.
|
||||
* @param windowBits
|
||||
* The base two logarithm of the size of the history buffer. The
|
||||
* value should be in the range {@code 9} to {@code 15} inclusive.
|
||||
* Larger values result in better compression at the expense of
|
||||
* memory usage. The default value is {@code 15}.
|
||||
* @param memLevel
|
||||
* How much memory should be allocated for the internal compression
|
||||
* state. {@code 1} uses minimum memory and {@code 9} uses maximum
|
||||
* memory. Larger values result in better and faster compression
|
||||
* at the expense of memory usage. The default value is {@code 8}
|
||||
*
|
||||
* @throws CompressionException if failed to initialize zlib
|
||||
*/
|
||||
public ZlibEncoder(ZlibWrapper wrapper, int compressionLevel, int windowBits, int memLevel) {
|
||||
|
||||
if (compressionLevel < 0 || compressionLevel > 9) {
|
||||
throw new IllegalArgumentException(
|
||||
"compressionLevel: " + compressionLevel +
|
||||
" (expected: 0-9)");
|
||||
}
|
||||
if (windowBits < 9 || windowBits > 15) {
|
||||
throw new IllegalArgumentException(
|
||||
"windowBits: " + windowBits + " (expected: 9-15)");
|
||||
}
|
||||
if (memLevel < 1 || memLevel > 9) {
|
||||
throw new IllegalArgumentException(
|
||||
"memLevel: " + memLevel + " (expected: 1-9)");
|
||||
}
|
||||
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.");
|
||||
}
|
||||
|
||||
synchronized (z) {
|
||||
int resultCode = z.deflateInit(
|
||||
compressionLevel, windowBits, memLevel,
|
||||
ZlibUtil.convertWrapperType(wrapper));
|
||||
if (resultCode != JZlib.Z_OK) {
|
||||
ZlibUtil.fail(z, "initialization failure", resultCode);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a new zlib encoder with the default compression level ({@code 6}),
|
||||
* default window bits ({@code 15}), default memory level ({@code 8}),
|
||||
* 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 ZlibEncoder(byte[] dictionary) {
|
||||
this(6, dictionary);
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a new zlib encoder with the specified {@code compressionLevel},
|
||||
* default window bits ({@code 15}), default memory level ({@code 8}),
|
||||
* 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 ZlibEncoder(int compressionLevel, byte[] dictionary) {
|
||||
this(compressionLevel, 15, 8, dictionary);
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a new zlib encoder with the specified {@code compressionLevel},
|
||||
* the specified {@code windowBits}, the specified {@code memLevel},
|
||||
* 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 windowBits
|
||||
* The base two logarithm of the size of the history buffer. The
|
||||
* value should be in the range {@code 9} to {@code 15} inclusive.
|
||||
* Larger values result in better compression at the expense of
|
||||
* memory usage. The default value is {@code 15}.
|
||||
* @param memLevel
|
||||
* How much memory should be allocated for the internal compression
|
||||
* state. {@code 1} uses minimum memory and {@code 9} uses maximum
|
||||
* memory. Larger values result in better and faster compression
|
||||
* at the expense of memory usage. The default value is {@code 8}
|
||||
* @param dictionary the preset dictionary
|
||||
*
|
||||
* @throws CompressionException if failed to initialize zlib
|
||||
*/
|
||||
public ZlibEncoder(int compressionLevel, int windowBits, int memLevel, byte[] dictionary) {
|
||||
if (compressionLevel < 0 || compressionLevel > 9) {
|
||||
throw new IllegalArgumentException("compressionLevel: " + compressionLevel + " (expected: 0-9)");
|
||||
}
|
||||
if (windowBits < 9 || windowBits > 15) {
|
||||
throw new IllegalArgumentException(
|
||||
"windowBits: " + windowBits + " (expected: 9-15)");
|
||||
}
|
||||
if (memLevel < 1 || memLevel > 9) {
|
||||
throw new IllegalArgumentException(
|
||||
"memLevel: " + memLevel + " (expected: 1-9)");
|
||||
}
|
||||
if (dictionary == null) {
|
||||
throw new NullPointerException("dictionary");
|
||||
}
|
||||
|
||||
synchronized (z) {
|
||||
int resultCode;
|
||||
resultCode = z.deflateInit(
|
||||
compressionLevel, windowBits, memLevel,
|
||||
JZlib.W_ZLIB); // Default: ZLIB format
|
||||
if (resultCode != JZlib.Z_OK) {
|
||||
ZlibUtil.fail(z, "initialization failure", resultCode);
|
||||
} else {
|
||||
resultCode = z.deflateSetDictionary(dictionary, dictionary.length);
|
||||
if (resultCode != JZlib.Z_OK) {
|
||||
ZlibUtil.fail(z, "failed to set the dictionary", resultCode);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
public ChannelFuture close() {
|
||||
return close(ctx().channel().newFuture());
|
||||
}
|
||||
|
||||
public ChannelFuture close(ChannelFuture 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;
|
||||
}
|
||||
|
||||
public boolean isClosed() {
|
||||
return finished.get();
|
||||
}
|
||||
|
||||
@Override
|
||||
public void encode(ChannelHandlerContext ctx,
|
||||
ByteBuf in, ByteBuf out) throws Exception {
|
||||
if (finished.get()) {
|
||||
return;
|
||||
}
|
||||
|
||||
synchronized (z) {
|
||||
try {
|
||||
// Configure input.
|
||||
int inputLength = in.readableBytes();
|
||||
boolean inHasArray = in.hasArray();
|
||||
z.avail_in = inputLength;
|
||||
if (inHasArray) {
|
||||
z.next_in = in.array();
|
||||
z.next_in_index = in.arrayOffset() + in.readerIndex();
|
||||
} else {
|
||||
byte[] array = new byte[inputLength];
|
||||
in.readBytes(array);
|
||||
z.next_in = array;
|
||||
z.next_in_index = 0;
|
||||
}
|
||||
int oldNextInIndex = z.next_in_index;
|
||||
|
||||
// Configure output.
|
||||
int maxOutputLength = (int) Math.ceil(inputLength * 1.001) + 12;
|
||||
boolean outHasArray = out.hasArray();
|
||||
z.avail_out = maxOutputLength;
|
||||
if (outHasArray) {
|
||||
out.ensureWritableBytes(maxOutputLength);
|
||||
z.next_out = out.array();
|
||||
z.next_out_index = out.arrayOffset() + out.writerIndex();
|
||||
} else {
|
||||
z.next_out = new byte[maxOutputLength];
|
||||
z.next_out_index = 0;
|
||||
}
|
||||
int oldNextOutIndex = z.next_out_index;
|
||||
|
||||
// Note that Z_PARTIAL_FLUSH has been deprecated.
|
||||
int resultCode;
|
||||
try {
|
||||
resultCode = z.deflate(JZlib.Z_SYNC_FLUSH);
|
||||
} finally {
|
||||
if (inHasArray) {
|
||||
in.skipBytes(z.next_in_index - oldNextInIndex);
|
||||
}
|
||||
}
|
||||
|
||||
if (resultCode != JZlib.Z_OK) {
|
||||
ZlibUtil.fail(z, "compression failure", resultCode);
|
||||
}
|
||||
|
||||
int outputLength = z.next_out_index - oldNextOutIndex;
|
||||
if (outputLength > 0) {
|
||||
if (outHasArray) {
|
||||
out.writerIndex(out.writerIndex() + outputLength);
|
||||
} else {
|
||||
out.writeBytes(z.next_out, 0, outputLength);
|
||||
}
|
||||
}
|
||||
} 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;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public void disconnect(
|
||||
final ChannelHandlerContext ctx,
|
||||
final ChannelFuture future) throws Exception {
|
||||
finishEncode(ctx, ctx.newFuture()).addListener(new ChannelFutureListener() {
|
||||
@Override
|
||||
public void operationComplete(ChannelFuture f) throws Exception {
|
||||
ctx.disconnect(future);
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
@Override
|
||||
public void close(
|
||||
final ChannelHandlerContext ctx,
|
||||
final ChannelFuture future) throws Exception {
|
||||
finishEncode(ctx, ctx.newFuture()).addListener(new ChannelFutureListener() {
|
||||
@Override
|
||||
public void operationComplete(ChannelFuture f) throws Exception {
|
||||
ctx.close(future);
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
private ChannelFuture finishEncode(ChannelHandlerContext ctx, ChannelFuture future) {
|
||||
if (!finished.compareAndSet(false, true)) {
|
||||
future.setSuccess();
|
||||
return future;
|
||||
}
|
||||
|
||||
ByteBuf footer;
|
||||
synchronized (z) {
|
||||
try {
|
||||
// Configure input.
|
||||
z.next_in = EMPTY_ARRAY;
|
||||
z.next_in_index = 0;
|
||||
z.avail_in = 0;
|
||||
|
||||
// Configure output.
|
||||
byte[] out = new byte[32]; // room for ADLER32 + ZLIB / CRC32 + GZIP header
|
||||
z.next_out = out;
|
||||
z.next_out_index = 0;
|
||||
z.avail_out = out.length;
|
||||
|
||||
// Write the ADLER32 checksum (stream footer).
|
||||
int resultCode = z.deflate(JZlib.Z_FINISH);
|
||||
if (resultCode != JZlib.Z_OK && resultCode != JZlib.Z_STREAM_END) {
|
||||
future.setFailure(ZlibUtil.exception(z, "compression failure", resultCode));
|
||||
return future;
|
||||
} else if (z.next_out_index != 0) {
|
||||
footer = Unpooled.wrappedBuffer(out, 0, z.next_out_index);
|
||||
} else {
|
||||
footer = Unpooled.EMPTY_BUFFER;
|
||||
}
|
||||
} finally {
|
||||
z.deflateEnd();
|
||||
|
||||
// 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;
|
||||
}
|
||||
}
|
||||
|
||||
ctx.write(footer, future);
|
||||
return future;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void beforeAdd(ChannelHandlerContext ctx) throws Exception {
|
||||
this.ctx = ctx;
|
||||
}
|
||||
}
|
||||
|
||||
@ -19,7 +19,7 @@ import io.netty.util.internal.jzlib.JZlib;
|
||||
import io.netty.util.internal.jzlib.ZStream;
|
||||
|
||||
/**
|
||||
* Utility methods used by {@link ZlibEncoder} and {@link ZlibDecoder}.
|
||||
* Utility methods used by {@link JZlibEncoder} and {@link JZlibDecoder}.
|
||||
*/
|
||||
final class ZlibUtil {
|
||||
|
||||
|
||||
@ -18,8 +18,7 @@ package io.netty.example.factorial;
|
||||
import io.netty.channel.ChannelInitializer;
|
||||
import io.netty.channel.ChannelPipeline;
|
||||
import io.netty.channel.socket.SocketChannel;
|
||||
import io.netty.handler.codec.compression.ZlibDecoder;
|
||||
import io.netty.handler.codec.compression.ZlibEncoder;
|
||||
import io.netty.handler.codec.compression.ZlibCodecFactory;
|
||||
import io.netty.handler.codec.compression.ZlibWrapper;
|
||||
|
||||
/**
|
||||
@ -38,8 +37,8 @@ public class FactorialClientInitializer extends ChannelInitializer<SocketChannel
|
||||
ChannelPipeline pipeline = ch.pipeline();
|
||||
|
||||
// Enable stream compression (you can remove these two if unnecessary)
|
||||
pipeline.addLast("deflater", new ZlibEncoder(ZlibWrapper.GZIP));
|
||||
pipeline.addLast("inflater", new ZlibDecoder(ZlibWrapper.GZIP));
|
||||
pipeline.addLast("deflater", ZlibCodecFactory.newZlibEncoder(ZlibWrapper.GZIP));
|
||||
pipeline.addLast("inflater", ZlibCodecFactory.newZlibDecoder(ZlibWrapper.GZIP));
|
||||
|
||||
// Add the number codec first,
|
||||
pipeline.addLast("decoder", new BigIntegerDecoder());
|
||||
|
||||
@ -18,8 +18,7 @@ package io.netty.example.factorial;
|
||||
import io.netty.channel.ChannelInitializer;
|
||||
import io.netty.channel.ChannelPipeline;
|
||||
import io.netty.channel.socket.SocketChannel;
|
||||
import io.netty.handler.codec.compression.ZlibDecoder;
|
||||
import io.netty.handler.codec.compression.ZlibEncoder;
|
||||
import io.netty.handler.codec.compression.ZlibCodecFactory;
|
||||
import io.netty.handler.codec.compression.ZlibWrapper;
|
||||
|
||||
/**
|
||||
@ -31,8 +30,8 @@ public class FactorialServerInitializer extends ChannelInitializer<SocketChannel
|
||||
ChannelPipeline pipeline = ch.pipeline();
|
||||
|
||||
// Enable stream compression (you can remove these two if unnecessary)
|
||||
pipeline.addLast("deflater", new ZlibEncoder(ZlibWrapper.GZIP));
|
||||
pipeline.addLast("inflater", new ZlibDecoder(ZlibWrapper.GZIP));
|
||||
pipeline.addLast("deflater", ZlibCodecFactory.newZlibEncoder(ZlibWrapper.GZIP));
|
||||
pipeline.addLast("inflater", ZlibCodecFactory.newZlibDecoder(ZlibWrapper.GZIP));
|
||||
|
||||
// Add the number codec first,
|
||||
pipeline.addLast("decoder", new BigIntegerDecoder());
|
||||
|
||||
@ -24,8 +24,7 @@ import io.netty.example.factorial.FactorialServerHandler;
|
||||
import io.netty.example.factorial.NumberEncoder;
|
||||
import io.netty.example.http.snoop.HttpSnoopServerHandler;
|
||||
import io.netty.example.securechat.SecureChatSslContextFactory;
|
||||
import io.netty.handler.codec.compression.ZlibDecoder;
|
||||
import io.netty.handler.codec.compression.ZlibEncoder;
|
||||
import io.netty.handler.codec.compression.ZlibCodecFactory;
|
||||
import io.netty.handler.codec.compression.ZlibWrapper;
|
||||
import io.netty.handler.codec.http.HttpContentCompressor;
|
||||
import io.netty.handler.codec.http.HttpRequestDecoder;
|
||||
@ -132,8 +131,8 @@ public class PortUnificationServerHandler extends ChannelInboundByteHandlerAdapt
|
||||
|
||||
private void enableGzip(ChannelHandlerContext ctx) {
|
||||
ChannelPipeline p = ctx.pipeline();
|
||||
p.addLast("gzipdeflater", new ZlibEncoder(ZlibWrapper.GZIP));
|
||||
p.addLast("gzipinflater", new ZlibDecoder(ZlibWrapper.GZIP));
|
||||
p.addLast("gzipdeflater", ZlibCodecFactory.newZlibEncoder(ZlibWrapper.GZIP));
|
||||
p.addLast("gzipinflater", ZlibCodecFactory.newZlibDecoder(ZlibWrapper.GZIP));
|
||||
p.addLast("unificationB", new PortUnificationServerHandler(detectSsl, false));
|
||||
p.remove(this);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user