Implemented LZMA frame encoder
Motivation: LZMA compression algorithm has a very good compression ratio. Modifications: - Added `lzma-java` library which implements LZMA algorithm. - Implemented LzmaFrameEncoder which extends MessageToByteEncoder and provides compression of outgoing messages. - Added tests to verify the LzmaFrameEncoder and how it can compress data for the next uncompression using the original library. Result: LZMA encoder which can compress data using LZMA algorithm.
This commit is contained in:
Idel Pivnitskiy
Norman Maurer
parent
08cec3c56b
commit
cf5aea52ed
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@ -122,6 +122,14 @@ and decompression library written by Adrien Grand. It can be obtained at:
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* HOMEPAGE:
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* https://github.com/jpountz/lz4-java
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This product optionally depends on 'lzma-java', a LZMA Java compression
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and decompression library, which can be obtained at:
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* LICENSE:
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* license/LICENSE.lzma-java.txt (Apache License 2.0)
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* HOMEPAGE:
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* https://github.com/jponge/lzma-java
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This product contains a modified portion of 'jfastlz', a Java port of FastLZ compression
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and decompression library written by William Kinney. It can be obtained at:
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@ -59,6 +59,11 @@
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<artifactId>lz4</artifactId>
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<optional>true</optional>
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</dependency>
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<dependency>
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<groupId>com.github.jponge</groupId>
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<artifactId>lzma-java</artifactId>
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<optional>true</optional>
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</dependency>
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<!-- Test dependencies for jboss marshalling encoder/decoder -->
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<dependency>
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@ -0,0 +1,215 @@
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/*
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* Copyright 2014 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.ByteBufInputStream;
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import io.netty.buffer.ByteBufOutputStream;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.MessageToByteEncoder;
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import io.netty.util.internal.logging.InternalLogger;
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import io.netty.util.internal.logging.InternalLoggerFactory;
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import lzma.sdk.lzma.Base;
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import lzma.sdk.lzma.Encoder;
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import java.io.InputStream;
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import static lzma.sdk.lzma.Encoder.*;
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/**
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* Compresses a {@link ByteBuf} using the LZMA algorithm.
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*
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* See <a href="http://en.wikipedia.org/wiki/Lempel%E2%80%93Ziv%E2%80%93Markov_chain_algorithm">LZMA</a>
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* and <a href="http://svn.python.org/projects/external/xz-5.0.5/doc/lzma-file-format.txt">LZMA format</a>
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* or documents in <a href="http://www.7-zip.org/sdk.html">LZMA SDK</a> archive.
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*/
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public class LzmaFrameEncoder extends MessageToByteEncoder<ByteBuf> {
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private static final InternalLogger logger = InternalLoggerFactory.getInstance(LzmaFrameEncoder.class);
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private static final int MEDIUM_DICTIONARY_SIZE = 1 << 16;
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private static final int MIN_FAST_BYTES = 5;
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private static final int MEDIUM_FAST_BYTES = 0x20;
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private static final int MAX_FAST_BYTES = Base.kMatchMaxLen;
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private static final int DEFAULT_MATCH_FINDER = EMatchFinderTypeBT4;
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private static final int DEFAULT_LC = 3;
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private static final int DEFAULT_LP = 0;
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private static final int DEFAULT_PB = 2;
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/**
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* Underlying LZMA encoder in use.
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*/
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private final Encoder encoder;
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/**
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* The Properties field contains three properties which are encoded using the following formula:
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*
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* <p>{@code Properties = (pb * 5 + lp) * 9 + lc}</p>
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*
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* The field consists of
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* <ol>
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* <li>the number of literal context bits (lc, [0, 8]);</li>
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* <li>the number of literal position bits (lp, [0, 4]);</li>
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* <li>the number of position bits (pb, [0, 4]).</li>
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* </ol>
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*/
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private final byte properties;
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/**
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* Dictionary Size is stored as an unsigned 32-bit little endian integer.
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*/
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private final int littleEndianDictionarySize;
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/**
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* For log warning only once.
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*/
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private static boolean warningLogged;
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/**
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* Creates LZMA encoder with default settings.
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*/
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public LzmaFrameEncoder() {
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this(MEDIUM_DICTIONARY_SIZE);
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}
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/**
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* Creates LZMA encoder with specified {@code lc}, {@code lp}, {@code pb}
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* values and the medium dictionary size of {@value #MEDIUM_DICTIONARY_SIZE}.
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*/
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public LzmaFrameEncoder(int lc, int lp, int pb) {
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this(lc, lp, pb, MEDIUM_DICTIONARY_SIZE);
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}
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/**
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* Creates LZMA encoder with specified dictionary size and default values of
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* {@code lc} = {@value #DEFAULT_LC},
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* {@code lp} = {@value #DEFAULT_LP},
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* {@code pb} = {@value #DEFAULT_PB}.
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*/
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public LzmaFrameEncoder(int dictionarySize) {
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this(DEFAULT_LC, DEFAULT_LP, DEFAULT_PB, dictionarySize);
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}
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/**
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* Creates LZMA encoder with specified {@code lc}, {@code lp}, {@code pb} values and custom dictionary size.
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*/
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public LzmaFrameEncoder(int lc, int lp, int pb, int dictionarySize) {
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this(lc, lp, pb, dictionarySize, false, MEDIUM_FAST_BYTES);
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}
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/**
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* Creates LZMA encoder with specified settings.
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*
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* @param lc
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* the number of "literal context" bits, available values [0, 8], default value {@value #DEFAULT_LC}.
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* @param lp
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* the number of "literal position" bits, available values [0, 4], default value {@value #DEFAULT_LP}.
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* @param pb
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* the number of "position" bits, available values [0, 4], default value {@value #DEFAULT_PB}.
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* @param dictionarySize
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* available values [0, {@link java.lang.Integer#MAX_VALUE}],
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* default value is {@value #MEDIUM_DICTIONARY_SIZE}.
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* @param endMarkerMode
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* indicates should {@link LzmaFrameEncoder} use end of stream marker or not.
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* Note, that {@link LzmaFrameEncoder} always sets size of uncompressed data
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* in LZMA header, so EOS marker is unnecessary. But you may use it for
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* better portability. For full description see "LZMA Decoding modes" section
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* of LZMA-Specification.txt in official LZMA SDK.
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* @param numFastBytes
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* available values [{@value #MIN_FAST_BYTES}, {@value #MAX_FAST_BYTES}].
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*/
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public LzmaFrameEncoder(int lc, int lp, int pb, int dictionarySize, boolean endMarkerMode, int numFastBytes) {
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if (lc < 0 || lc > 8) {
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throw new IllegalArgumentException("lc: " + lc + " (expected: 0-8)");
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}
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if (lp < 0 || lp > 4) {
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throw new IllegalArgumentException("lp: " + lp + " (expected: 0-4)");
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}
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if (pb < 0 || pb > 4) {
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throw new IllegalArgumentException("pb: " + pb + " (expected: 0-4)");
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}
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if (lc + pb > 4) {
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if (!warningLogged) {
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logger.warn("The latest versions of LZMA libraries (for example, XZ Utils) " +
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"has an additional requirement: lc + lp <= 4. Data which don't follow " +
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"this requirement cannot be decompressed with this libraries.");
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warningLogged = true;
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}
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}
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if (dictionarySize < 0) {
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throw new IllegalArgumentException("dictionarySize: " + dictionarySize + " (expected: 0+)");
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}
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if (numFastBytes < MIN_FAST_BYTES || numFastBytes > MAX_FAST_BYTES) {
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throw new IllegalArgumentException(String.format(
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"numFastBytes: %d (expected: %d-%d)", numFastBytes, MIN_FAST_BYTES, MAX_FAST_BYTES
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));
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}
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encoder = new Encoder();
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encoder.setDictionarySize(dictionarySize);
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encoder.setEndMarkerMode(endMarkerMode);
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encoder.setMatchFinder(DEFAULT_MATCH_FINDER);
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encoder.setNumFastBytes(numFastBytes);
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encoder.setLcLpPb(lc, lp, pb);
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properties = (byte) ((pb * 5 + lp) * 9 + lc);
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littleEndianDictionarySize = Integer.reverseBytes(dictionarySize);
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}
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@Override
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protected void encode(ChannelHandlerContext ctx, ByteBuf in, ByteBuf out) throws Exception {
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final int length = in.readableBytes();
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final InputStream bbIn = new ByteBufInputStream(in);
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final ByteBufOutputStream bbOut = new ByteBufOutputStream(out);
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bbOut.writeByte(properties);
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bbOut.writeInt(littleEndianDictionarySize);
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bbOut.writeLong(Long.reverseBytes(length));
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encoder.code(bbIn, bbOut, -1, -1, null);
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bbIn.close();
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bbOut.close();
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}
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@Override
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protected ByteBuf allocateBuffer(ChannelHandlerContext ctx, ByteBuf in, boolean preferDirect) throws Exception {
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final int length = in.readableBytes();
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final int maxOutputLength = maxOutputBufferLength(length);
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return ctx.alloc().ioBuffer(maxOutputLength);
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}
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/**
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* Calculates maximum possible size of output buffer for not compressible data.
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*/
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private static int maxOutputBufferLength(int inputLength) {
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double factor;
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if (inputLength < 200) {
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factor = 1.5;
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} else if (inputLength < 500) {
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factor = 1.2;
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} else if (inputLength < 1000) {
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factor = 1.1;
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} else if (inputLength < 10000) {
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factor = 1.05;
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} else {
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factor = 1.02;
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}
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return 13 + (int) (inputLength * factor);
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}
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}
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@ -21,4 +21,3 @@
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* <a href="http://code.google.com/p/snappy/">Snappy</a>.
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*/
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package io.netty.handler.codec.compression;
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// TODO Implement lzma handler
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@ -0,0 +1,145 @@
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/*
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* Copyright 2014 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.ByteBufInputStream;
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import io.netty.buffer.CompositeByteBuf;
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import io.netty.buffer.Unpooled;
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import io.netty.channel.embedded.EmbeddedChannel;
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import io.netty.util.internal.ThreadLocalRandom;
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import lzma.sdk.lzma.Decoder;
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import lzma.streams.LzmaInputStream;
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import org.junit.Before;
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import org.junit.Test;
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import java.io.InputStream;
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import static org.junit.Assert.*;
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public class LzmaFrameEncoderTest {
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private static final ThreadLocalRandom rand;
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private static final byte[] BYTES_SMALL = new byte[256];
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private static final byte[] BYTES_LARGE = new byte[256000];
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static {
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rand = ThreadLocalRandom.current();
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rand.nextBytes(BYTES_SMALL);
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rand.nextBytes(BYTES_LARGE);
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}
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private EmbeddedChannel channel;
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@Before
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public void initChannel() {
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channel = new EmbeddedChannel(new LzmaFrameEncoder());
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}
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private static void testCompression(final EmbeddedChannel channel, final byte[] data) throws Exception {
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ByteBuf in = Unpooled.wrappedBuffer(data);
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assertTrue(channel.writeOutbound(in));
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assertTrue(channel.finish());
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byte[] uncompressed = uncompress(channel, data.length);
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assertArrayEquals(data, uncompressed);
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}
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@Test
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public void testCompressionOfSmallChunkOfData() throws Exception {
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testCompression(channel, BYTES_SMALL);
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}
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@Test
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public void testCompressionOfLargeChunkOfData() throws Exception {
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testCompression(channel, BYTES_LARGE);
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}
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@Test
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public void testCompressionOfBatchedFlowOfData() throws Exception {
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final byte[] data = BYTES_SMALL;
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int written = 0, length = rand.nextInt(50);
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while (written + length < data.length) {
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ByteBuf in = Unpooled.wrappedBuffer(data, written, length);
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assertTrue(channel.writeOutbound(in));
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written += length;
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length = rand.nextInt(50);
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}
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ByteBuf in = Unpooled.wrappedBuffer(data, written, data.length - written);
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assertTrue(channel.writeOutbound(in));
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assertTrue(channel.finish());
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byte[] uncompressed = new byte[data.length];
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int outOffset = 0;
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ByteBuf msg;
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while ((msg = channel.readOutbound()) != null) {
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InputStream is = new ByteBufInputStream(msg);
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LzmaInputStream lzmaIs = new LzmaInputStream(is, new Decoder());
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for (;;) {
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int read = lzmaIs.read(uncompressed, outOffset, data.length - outOffset);
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if (read > 0) {
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outOffset += read;
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} else {
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break;
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}
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}
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assertEquals(0, is.available());
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assertEquals(-1, is.read());
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is.close();
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lzmaIs.close();
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msg.release();
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}
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assertArrayEquals(data, uncompressed);
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}
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private static byte[] uncompress(EmbeddedChannel channel, int length) throws Exception {
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CompositeByteBuf out = Unpooled.compositeBuffer();
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ByteBuf msg;
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while ((msg = channel.readOutbound()) != null) {
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out.addComponent(msg);
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out.writerIndex(out.writerIndex() + msg.readableBytes());
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}
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InputStream is = new ByteBufInputStream(out);
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LzmaInputStream lzmaIs = new LzmaInputStream(is, new Decoder());
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byte[] uncompressed = new byte[length];
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int remaining = length;
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while (remaining > 0) {
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int read = lzmaIs.read(uncompressed, length - remaining, remaining);
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if (read > 0) {
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remaining -= read;
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} else {
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break;
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}
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}
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assertEquals(0, is.available());
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assertEquals(-1, is.read());
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assertEquals(-1, lzmaIs.read());
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is.close();
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lzmaIs.close();
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out.release();
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return uncompressed;
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}
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}
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@ -0,0 +1,202 @@
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Apache License
|
||||
Version 2.0, January 2004
|
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http://www.apache.org/licenses/
|
||||
|
||||
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
|
||||
|
||||
1. Definitions.
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||||
|
||||
"License" shall mean the terms and conditions for use, reproduction,
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and distribution as defined by Sections 1 through 9 of this document.
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"You" (or "Your") shall mean an individual or Legal Entity
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|
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Notwithstanding the above, nothing herein shall supersede or modify
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|
||||
END OF TERMS AND CONDITIONS
|
||||
|
||||
APPENDIX: How to apply the Apache License to your work.
|
||||
|
||||
To apply the Apache License to your work, attach the following
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|
||||
Copyright [yyyy] [name of copyright owner]
|
||||
|
||||
Licensed 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
|
||||
|
||||
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|
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|
||||
Unless required by applicable law or agreed to in writing, software
|
||||
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See the License for the specific language governing permissions and
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|
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Reference in New Issue