Implemented LZF compression codec
Motivation: LZF compression codec provides sending and receiving data encoded by very fast LZF algorithm. Modifications: - Added Compress-LZF library which implements LZF algorithm - Implemented LzfEncoder which extends MessageToByteEncoder and provides compression of outgoing messages - Added tests to verify the LzfEncoder and how it can compress data for the next uncompression using the original library - Implemented LzfDecoder which extends ByteToMessageDecoder and provides uncompression of incoming messages - Added tests to verify the LzfDecoder and how it can uncompress data after compression using the original library - Added integration tests for LzfEncoder/Decoder Result: Full LZF compression codec which can compress/uncompress data using LZF algorithm.
This commit is contained in:
parent
d8a78424b3
commit
2b37b692d8
@ -97,6 +97,14 @@ pure Java, which can be obtained at:
|
||||
* HOMEPAGE:
|
||||
* http://www.jcraft.com/jzlib/
|
||||
|
||||
This product optionally depends on 'Compress-LZF', a Java library for encoding and
|
||||
decoding data in LZF format, written by Tatu Saloranta. It can be obtained at:
|
||||
|
||||
* LICENSE:
|
||||
* license/LICENSE.compress-lzf.txt (Apache License 2.0)
|
||||
* HOMEPAGE:
|
||||
* https://github.com/ning/compress
|
||||
|
||||
This product optionally depends on 'Protocol Buffers', Google's data
|
||||
interchange format, which can be obtained at:
|
||||
|
||||
|
@ -49,6 +49,11 @@
|
||||
<artifactId>jzlib</artifactId>
|
||||
<optional>true</optional>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>com.ning</groupId>
|
||||
<artifactId>compress-lzf</artifactId>
|
||||
<optional>true</optional>
|
||||
</dependency>
|
||||
|
||||
<!-- Test dependencies for jboss marshalling encoder/decoder -->
|
||||
<dependency>
|
||||
|
@ -0,0 +1,179 @@
|
||||
/*
|
||||
* Copyright 2014 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 com.ning.compress.BufferRecycler;
|
||||
import com.ning.compress.lzf.ChunkDecoder;
|
||||
import com.ning.compress.lzf.util.ChunkDecoderFactory;
|
||||
import io.netty.buffer.ByteBuf;
|
||||
import io.netty.channel.ChannelHandlerContext;
|
||||
import io.netty.handler.codec.ByteToMessageDecoder;
|
||||
|
||||
import java.util.List;
|
||||
|
||||
import static com.ning.compress.lzf.LZFChunk.BYTE_Z;
|
||||
import static com.ning.compress.lzf.LZFChunk.BYTE_V;
|
||||
import static com.ning.compress.lzf.LZFChunk.MAX_HEADER_LEN;
|
||||
import static com.ning.compress.lzf.LZFChunk.HEADER_LEN_COMPRESSED;
|
||||
import static com.ning.compress.lzf.LZFChunk.HEADER_LEN_NOT_COMPRESSED;
|
||||
import static com.ning.compress.lzf.LZFChunk.BLOCK_TYPE_NON_COMPRESSED;
|
||||
import static com.ning.compress.lzf.LZFChunk.BLOCK_TYPE_COMPRESSED;
|
||||
|
||||
/**
|
||||
* Uncompresses a {@link ByteBuf} encoded with the LZF format.
|
||||
*
|
||||
* See original <a href="http://oldhome.schmorp.de/marc/liblzf.html">LZF package</a>
|
||||
* and <a href="https://github.com/ning/compress/wiki/LZFFormat">LZF format</a> for full description.
|
||||
*/
|
||||
public class LzfDecoder extends ByteToMessageDecoder {
|
||||
/**
|
||||
* A brief signature for content auto-detection.
|
||||
*/
|
||||
private static final short SIGNATURE_OF_CHUNK = BYTE_Z << 8 | BYTE_V;
|
||||
|
||||
/**
|
||||
* Offset to the "Type" in chunk header.
|
||||
*/
|
||||
private static final int TYPE_OFFSET = 2;
|
||||
|
||||
/**
|
||||
* Offset to the "ChunkLength" in chunk header.
|
||||
*/
|
||||
private static final int CHUNK_LENGTH_OFFSET = 3;
|
||||
|
||||
/**
|
||||
* Offset to the "OriginalLength" in chunk header.
|
||||
*/
|
||||
private static final int ORIGINAL_LENGTH_OFFSET = 5;
|
||||
|
||||
/**
|
||||
* Underlying decoder in use.
|
||||
*/
|
||||
private final ChunkDecoder decoder;
|
||||
|
||||
/**
|
||||
* Object that handles details of buffer recycling.
|
||||
*/
|
||||
private final BufferRecycler recycler;
|
||||
|
||||
/**
|
||||
* Determines the state of flow.
|
||||
*/
|
||||
private boolean corrupted;
|
||||
|
||||
/**
|
||||
* Creates a new LZF decoder with the most optimal available methods for underlying data access.
|
||||
* It will "unsafe" instance if one can be used on current JVM.
|
||||
* It should be safe to call this constructor as implementations are dynamically loaded; however, on some
|
||||
* non-standard platforms it may be necessary to use {@link #LzfDecoder(boolean)} with {@code true} param.
|
||||
*/
|
||||
public LzfDecoder() {
|
||||
this(false);
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a new LZF decoder with specified decoding instance.
|
||||
*
|
||||
* @param safeInstance
|
||||
* If {@code true} decoder will use {@link ChunkDecoder} that only uses standard JDK access methods,
|
||||
* and should work on all Java platforms and JVMs.
|
||||
* Otherwise decoder will try to use highly optimized {@link ChunkDecoder} implementation that uses
|
||||
* Sun JDK's {@link sun.misc.Unsafe} class (which may be included by other JDK's as well).
|
||||
*/
|
||||
public LzfDecoder(boolean safeInstance) {
|
||||
decoder = safeInstance ?
|
||||
ChunkDecoderFactory.safeInstance()
|
||||
: ChunkDecoderFactory.optimalInstance();
|
||||
|
||||
recycler = BufferRecycler.instance();
|
||||
}
|
||||
|
||||
@Override
|
||||
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
|
||||
for (;;) {
|
||||
if (corrupted) {
|
||||
in.skipBytes(in.readableBytes());
|
||||
return;
|
||||
}
|
||||
|
||||
if (in.readableBytes() < HEADER_LEN_NOT_COMPRESSED) {
|
||||
return;
|
||||
}
|
||||
final int idx = in.readerIndex();
|
||||
final int type = in.getByte(idx + TYPE_OFFSET);
|
||||
final int chunkLength = in.getUnsignedShort(idx + CHUNK_LENGTH_OFFSET);
|
||||
final int totalLength = (type == BLOCK_TYPE_NON_COMPRESSED ?
|
||||
HEADER_LEN_NOT_COMPRESSED : MAX_HEADER_LEN) + chunkLength;
|
||||
if (in.readableBytes() < totalLength) {
|
||||
return;
|
||||
}
|
||||
|
||||
try {
|
||||
if (in.getUnsignedShort(idx) != SIGNATURE_OF_CHUNK) {
|
||||
throw new DecompressionException("Unexpected signature of chunk");
|
||||
}
|
||||
switch (type) {
|
||||
case BLOCK_TYPE_NON_COMPRESSED: {
|
||||
in.skipBytes(HEADER_LEN_NOT_COMPRESSED);
|
||||
out.add(in.readBytes(chunkLength));
|
||||
break;
|
||||
}
|
||||
case BLOCK_TYPE_COMPRESSED: {
|
||||
final int originalLength = in.getUnsignedShort(idx + ORIGINAL_LENGTH_OFFSET);
|
||||
|
||||
final byte[] inputArray;
|
||||
final int inPos;
|
||||
if (in.hasArray()) {
|
||||
inputArray = in.array();
|
||||
inPos = in.arrayOffset() + idx + HEADER_LEN_COMPRESSED;
|
||||
} else {
|
||||
inputArray = recycler.allocInputBuffer(chunkLength);
|
||||
in.getBytes(idx + HEADER_LEN_COMPRESSED, inputArray, 0, chunkLength);
|
||||
inPos = 0;
|
||||
}
|
||||
|
||||
ByteBuf uncompressed = ctx.alloc().heapBuffer(originalLength, originalLength);
|
||||
final byte[] outputArray = uncompressed.array();
|
||||
final int outPos = uncompressed.arrayOffset();
|
||||
|
||||
boolean success = false;
|
||||
try {
|
||||
decoder.decodeChunk(inputArray, inPos, outputArray, outPos, outPos + originalLength);
|
||||
uncompressed.writerIndex(uncompressed.writerIndex() + originalLength);
|
||||
out.add(uncompressed);
|
||||
in.skipBytes(totalLength);
|
||||
success = true;
|
||||
} finally {
|
||||
if (!success) {
|
||||
uncompressed.release();
|
||||
}
|
||||
}
|
||||
|
||||
if (!in.hasArray()) {
|
||||
recycler.releaseInputBuffer(inputArray);
|
||||
}
|
||||
break;
|
||||
}
|
||||
default:
|
||||
throw new DecompressionException("Unknown type of chunk: " + type + " (expected: 0 or 1)");
|
||||
}
|
||||
} catch (Exception e) {
|
||||
corrupted = true;
|
||||
throw e;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
@ -0,0 +1,140 @@
|
||||
/*
|
||||
* Copyright 2014 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 com.ning.compress.BufferRecycler;
|
||||
import com.ning.compress.lzf.ChunkEncoder;
|
||||
import com.ning.compress.lzf.LZFEncoder;
|
||||
import com.ning.compress.lzf.util.ChunkEncoderFactory;
|
||||
import io.netty.buffer.ByteBuf;
|
||||
import io.netty.channel.ChannelHandlerContext;
|
||||
import io.netty.handler.codec.MessageToByteEncoder;
|
||||
|
||||
import static com.ning.compress.lzf.LZFChunk.*;
|
||||
|
||||
/**
|
||||
* Compresses a {@link ByteBuf} using the LZF format.
|
||||
*
|
||||
* See original <a href="http://oldhome.schmorp.de/marc/liblzf.html">LZF package</a>
|
||||
* and <a href="https://github.com/ning/compress/wiki/LZFFormat">LZF format</a> for full description.
|
||||
*/
|
||||
public class LzfEncoder extends MessageToByteEncoder<ByteBuf> {
|
||||
/**
|
||||
* Minimum block size ready for compression. Blocks with length
|
||||
* less than {@link #MIN_BLOCK_TO_COMPRESS} will write as uncompressed.
|
||||
*/
|
||||
private static final int MIN_BLOCK_TO_COMPRESS = 16;
|
||||
|
||||
/**
|
||||
* Underlying decoder in use.
|
||||
*/
|
||||
private final ChunkEncoder encoder;
|
||||
|
||||
/**
|
||||
* Object that handles details of buffer recycling.
|
||||
*/
|
||||
private final BufferRecycler recycler;
|
||||
|
||||
/**
|
||||
* Creates a new LZF encoder with the most optimal available methods for underlying data access.
|
||||
* It will "unsafe" instance if one can be used on current JVM.
|
||||
* It should be safe to call this constructor as implementations are dynamically loaded; however, on some
|
||||
* non-standard platforms it may be necessary to use {@link #LzfEncoder(boolean)} with {@code true} param.
|
||||
*/
|
||||
public LzfEncoder() {
|
||||
this(false, MAX_CHUNK_LEN);
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a new LZF encoder with specified encoding instance.
|
||||
*
|
||||
* @param safeInstance
|
||||
* If {@code true} encoder will use {@link ChunkEncoder} that only uses standard JDK access methods,
|
||||
* and should work on all Java platforms and JVMs.
|
||||
* Otherwise encoder will try to use highly optimized {@link ChunkEncoder} implementation that uses
|
||||
* Sun JDK's {@link sun.misc.Unsafe} class (which may be included by other JDK's as well).
|
||||
*/
|
||||
public LzfEncoder(boolean safeInstance) {
|
||||
this(safeInstance, MAX_CHUNK_LEN);
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a new LZF encoder with specified total length of encoded chunk. You can configure it to encode
|
||||
* your data flow more efficient if you know the avarage size of messages that you send.
|
||||
*
|
||||
* @param totalLength
|
||||
* Expected total length of content to compress; only matters for outgoing messages that is smaller
|
||||
* than maximum chunk size (64k), to optimize encoding hash tables.
|
||||
*/
|
||||
public LzfEncoder(int totalLength) {
|
||||
this(false, totalLength);
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a new LZF encoder with specified settings.
|
||||
*
|
||||
* @param safeInstance
|
||||
* If {@code true} encoder will use {@link ChunkEncoder} that only uses standard JDK access methods,
|
||||
* and should work on all Java platforms and JVMs.
|
||||
* Otherwise encoder will try to use highly optimized {@link ChunkEncoder} implementation that uses
|
||||
* Sun JDK's {@link sun.misc.Unsafe} class (which may be included by other JDK's as well).
|
||||
* @param totalLength
|
||||
* Expected total length of content to compress; only matters for outgoing messages that is smaller
|
||||
* than maximum chunk size (64k), to optimize encoding hash tables.
|
||||
*/
|
||||
public LzfEncoder(boolean safeInstance, int totalLength) {
|
||||
super(false);
|
||||
if (totalLength < MIN_BLOCK_TO_COMPRESS || totalLength > MAX_CHUNK_LEN) {
|
||||
throw new IllegalArgumentException("totalLength: " + totalLength +
|
||||
" (expected: " + MIN_BLOCK_TO_COMPRESS + '-' + MAX_CHUNK_LEN + ')');
|
||||
}
|
||||
|
||||
encoder = safeInstance ?
|
||||
ChunkEncoderFactory.safeNonAllocatingInstance(totalLength)
|
||||
: ChunkEncoderFactory.optimalNonAllocatingInstance(totalLength);
|
||||
|
||||
recycler = BufferRecycler.instance();
|
||||
}
|
||||
|
||||
@Override
|
||||
protected void encode(ChannelHandlerContext ctx, ByteBuf in, ByteBuf out) throws Exception {
|
||||
final int length = in.readableBytes();
|
||||
final int idx = in.readerIndex();
|
||||
final byte[] input;
|
||||
final int inputPtr;
|
||||
if (in.hasArray()) {
|
||||
input = in.array();
|
||||
inputPtr = in.arrayOffset() + idx;
|
||||
} else {
|
||||
input = recycler.allocInputBuffer(length);
|
||||
in.getBytes(idx, input, 0, length);
|
||||
inputPtr = 0;
|
||||
}
|
||||
|
||||
final int maxOutputLength = LZFEncoder.estimateMaxWorkspaceSize(length);
|
||||
out.ensureWritable(maxOutputLength);
|
||||
final byte[] output = out.array();
|
||||
final int outputPtr = out.arrayOffset() + out.writerIndex();
|
||||
final int outputLength = LZFEncoder.appendEncoded(encoder,
|
||||
input, inputPtr, length, output, outputPtr) - outputPtr;
|
||||
out.writerIndex(out.writerIndex() + outputLength);
|
||||
in.skipBytes(length);
|
||||
|
||||
if (!in.hasArray()) {
|
||||
recycler.releaseInputBuffer(input);
|
||||
}
|
||||
}
|
||||
}
|
@ -0,0 +1,148 @@
|
||||
/*
|
||||
* Copyright 2014 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 com.ning.compress.lzf.LZFEncoder;
|
||||
import io.netty.buffer.ByteBuf;
|
||||
import io.netty.buffer.CompositeByteBuf;
|
||||
import io.netty.buffer.Unpooled;
|
||||
import io.netty.channel.embedded.EmbeddedChannel;
|
||||
import io.netty.util.internal.ThreadLocalRandom;
|
||||
import org.junit.Before;
|
||||
import org.junit.Rule;
|
||||
import org.junit.Test;
|
||||
import org.junit.rules.ExpectedException;
|
||||
|
||||
import static com.ning.compress.lzf.LZFChunk.BYTE_Z;
|
||||
import static com.ning.compress.lzf.LZFChunk.BYTE_V;
|
||||
import static com.ning.compress.lzf.LZFChunk.BLOCK_TYPE_NON_COMPRESSED;
|
||||
import static org.junit.Assert.*;
|
||||
|
||||
public class LzfDecoderTest {
|
||||
|
||||
private static final ThreadLocalRandom rand;
|
||||
|
||||
private static final byte[] BYTES_SMALL = new byte[256];
|
||||
private static final byte[] BYTES_LARGE = new byte[256000];
|
||||
|
||||
static {
|
||||
rand = ThreadLocalRandom.current();
|
||||
//fill arrays with compressible data
|
||||
for (int i = 0; i < BYTES_SMALL.length; i++) {
|
||||
BYTES_SMALL[i] = i % 4 != 0 ? 0 : (byte) rand.nextInt();
|
||||
}
|
||||
for (int i = 0; i < BYTES_LARGE.length; i++) {
|
||||
BYTES_LARGE[i] = i % 4 != 0 ? 0 : (byte) rand.nextInt();
|
||||
}
|
||||
}
|
||||
|
||||
@Rule
|
||||
public ExpectedException expected = ExpectedException.none();
|
||||
|
||||
private EmbeddedChannel channel;
|
||||
|
||||
@Before
|
||||
public void initChannel() {
|
||||
channel = new EmbeddedChannel(new LzfDecoder());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testUnexpectedSignatureOfChunk() throws Exception {
|
||||
expected.expect(DecompressionException.class);
|
||||
expected.expectMessage("Unexpected signature of chunk");
|
||||
|
||||
ByteBuf in = Unpooled.buffer();
|
||||
in.writeShort(0x1234); //random value
|
||||
in.writeByte(BLOCK_TYPE_NON_COMPRESSED);
|
||||
in.writeShort(0);
|
||||
|
||||
channel.writeInbound(in);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testUnknownTypeOfChunk() throws Exception {
|
||||
expected.expect(DecompressionException.class);
|
||||
expected.expectMessage("Unknown type of chunk");
|
||||
|
||||
ByteBuf in = Unpooled.buffer();
|
||||
in.writeByte(BYTE_Z);
|
||||
in.writeByte(BYTE_V);
|
||||
in.writeByte(0xFF); //random value
|
||||
in.writeInt(0);
|
||||
|
||||
channel.writeInbound(in);
|
||||
}
|
||||
|
||||
private static void testDecompression(final EmbeddedChannel channel, final byte[] data) throws Exception {
|
||||
byte[] compressedArray = LZFEncoder.encode(data);
|
||||
ByteBuf compressed = Unpooled.wrappedBuffer(compressedArray);
|
||||
|
||||
channel.writeInbound(compressed);
|
||||
|
||||
ByteBuf uncompressed = readUncompressed(channel);
|
||||
ByteBuf dataBuf = Unpooled.wrappedBuffer(data);
|
||||
|
||||
assertEquals(dataBuf, uncompressed);
|
||||
|
||||
uncompressed.release();
|
||||
dataBuf.release();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testDecompressionOfSmallChunkOfData() throws Exception {
|
||||
testDecompression(channel, BYTES_SMALL);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testDecompressionOfLargeChunkOfData() throws Exception {
|
||||
testDecompression(channel, BYTES_LARGE);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testDecompressionOfBatchedFlowOfData() throws Exception {
|
||||
final byte[] data = BYTES_LARGE;
|
||||
|
||||
byte[] compressedArray = LZFEncoder.encode(data);
|
||||
int written = 0, length = rand.nextInt(100);
|
||||
while (written + length < compressedArray.length) {
|
||||
ByteBuf compressed = Unpooled.wrappedBuffer(compressedArray, written, length);
|
||||
channel.writeInbound(compressed);
|
||||
written += length;
|
||||
length = rand.nextInt(100);
|
||||
}
|
||||
ByteBuf compressed = Unpooled.wrappedBuffer(compressedArray, written, compressedArray.length - written);
|
||||
channel.writeInbound(compressed);
|
||||
|
||||
ByteBuf uncompressed = readUncompressed(channel);
|
||||
ByteBuf dataBuf = Unpooled.wrappedBuffer(data);
|
||||
|
||||
assertEquals(dataBuf, uncompressed);
|
||||
|
||||
uncompressed.release();
|
||||
dataBuf.release();
|
||||
}
|
||||
|
||||
private static ByteBuf readUncompressed(EmbeddedChannel channel) throws Exception {
|
||||
CompositeByteBuf uncompressed = Unpooled.compositeBuffer();
|
||||
ByteBuf msg;
|
||||
while ((msg = channel.readInbound()) != null) {
|
||||
uncompressed.addComponent(msg);
|
||||
uncompressed.writerIndex(uncompressed.writerIndex() + msg.readableBytes());
|
||||
}
|
||||
|
||||
return uncompressed;
|
||||
}
|
||||
}
|
@ -0,0 +1,108 @@
|
||||
/*
|
||||
* Copyright 2014 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 com.ning.compress.lzf.LZFDecoder;
|
||||
import io.netty.buffer.ByteBuf;
|
||||
import io.netty.buffer.CompositeByteBuf;
|
||||
import io.netty.buffer.Unpooled;
|
||||
import io.netty.channel.embedded.EmbeddedChannel;
|
||||
import io.netty.util.internal.ThreadLocalRandom;
|
||||
import org.junit.Before;
|
||||
import org.junit.Test;
|
||||
|
||||
import static org.junit.Assert.*;
|
||||
|
||||
public class LzfEncoderTest {
|
||||
|
||||
private static final ThreadLocalRandom rand;
|
||||
|
||||
private static final byte[] BYTES_SMALL = new byte[256];
|
||||
private static final byte[] BYTES_LARGE = new byte[256000];
|
||||
|
||||
static {
|
||||
rand = ThreadLocalRandom.current();
|
||||
//fill arrays with compressible data
|
||||
for (int i = 0; i < BYTES_SMALL.length; i++) {
|
||||
BYTES_SMALL[i] = i % 4 != 0 ? 0 : (byte) rand.nextInt();
|
||||
}
|
||||
for (int i = 0; i < BYTES_LARGE.length; i++) {
|
||||
BYTES_LARGE[i] = i % 4 != 0 ? 0 : (byte) rand.nextInt();
|
||||
}
|
||||
}
|
||||
|
||||
private EmbeddedChannel channel;
|
||||
|
||||
@Before
|
||||
public void initChannel() {
|
||||
channel = new EmbeddedChannel(new LzfEncoder());
|
||||
}
|
||||
|
||||
private static void testCompression(final EmbeddedChannel channel, final byte[] data) throws Exception {
|
||||
ByteBuf in = Unpooled.wrappedBuffer(data);
|
||||
channel.writeOutbound(in);
|
||||
channel.finish();
|
||||
|
||||
final byte[] uncompressed = uncompress(channel);
|
||||
|
||||
assertArrayEquals(data, uncompressed);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testCompressionOfSmallChunkOfData() throws Exception {
|
||||
testCompression(channel, BYTES_SMALL);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testCompressionOfLargeChunkOfData() throws Exception {
|
||||
testCompression(channel, BYTES_LARGE);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testCompressionOfBatchedFlowOfData() throws Exception {
|
||||
final byte[] data = BYTES_LARGE;
|
||||
|
||||
int written = 0, length = rand.nextInt(100);
|
||||
while (written + length < data.length) {
|
||||
ByteBuf in = Unpooled.wrappedBuffer(data, written, length);
|
||||
channel.writeOutbound(in);
|
||||
written += length;
|
||||
length = rand.nextInt(100);
|
||||
}
|
||||
ByteBuf in = Unpooled.wrappedBuffer(data, written, data.length - written);
|
||||
channel.writeOutbound(in);
|
||||
channel.finish();
|
||||
|
||||
final byte[] uncompressed = uncompress(channel);
|
||||
|
||||
assertArrayEquals(data, uncompressed);
|
||||
}
|
||||
|
||||
private static byte[] uncompress(EmbeddedChannel channel) throws Exception {
|
||||
CompositeByteBuf out = Unpooled.compositeBuffer();
|
||||
ByteBuf msg;
|
||||
while ((msg = channel.readOutbound()) != null) {
|
||||
out.addComponent(msg);
|
||||
out.writerIndex(out.writerIndex() + msg.readableBytes());
|
||||
}
|
||||
|
||||
byte[] compressed = new byte[out.readableBytes()];
|
||||
out.readBytes(compressed);
|
||||
out.release();
|
||||
|
||||
return LZFDecoder.decode(compressed);
|
||||
}
|
||||
}
|
@ -0,0 +1,156 @@
|
||||
/*
|
||||
* Copyright 2014 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.CompositeByteBuf;
|
||||
import io.netty.buffer.Unpooled;
|
||||
import io.netty.channel.embedded.EmbeddedChannel;
|
||||
import io.netty.util.ReferenceCountUtil;
|
||||
import io.netty.util.internal.ThreadLocalRandom;
|
||||
import org.junit.Test;
|
||||
|
||||
import java.util.Arrays;
|
||||
|
||||
import static org.hamcrest.Matchers.*;
|
||||
import static org.junit.Assert.*;
|
||||
|
||||
public class LzfIntegrationTest {
|
||||
|
||||
private static final ThreadLocalRandom rand = ThreadLocalRandom.current();
|
||||
|
||||
public static final byte[] EMPTY = new byte[0];
|
||||
|
||||
@Test
|
||||
public void testEmpty() throws Exception {
|
||||
testIdentity(EMPTY);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testOneByte() throws Exception {
|
||||
testIdentity(new byte[] { 'A' });
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testTwoBytes() throws Exception {
|
||||
testIdentity(new byte[] { 'B', 'A' });
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testRegular() throws Exception {
|
||||
byte[] data = ("Netty is a NIO client server framework which enables quick and easy development " +
|
||||
"of network applications such as protocol servers and clients.").getBytes();
|
||||
testIdentity(data);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testLargeRandom() throws Exception {
|
||||
byte[] data = new byte[1048576];
|
||||
rand.nextBytes(data);
|
||||
testIdentity(data);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testPartRandom() throws Exception {
|
||||
byte[] data = new byte[12345];
|
||||
rand.nextBytes(data);
|
||||
for (int i = 0; i < 1024; i++) {
|
||||
data[i] = 123;
|
||||
}
|
||||
testIdentity(data);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testCompressible() throws Exception {
|
||||
byte[] data = new byte[10000];
|
||||
for (int i = 0; i < data.length; i++) {
|
||||
data[i] = i % 4 != 0 ? 0 : (byte) rand.nextInt();
|
||||
}
|
||||
testIdentity(data);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testLongBlank() throws Exception {
|
||||
byte[] data = new byte[100000];
|
||||
testIdentity(data);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testLongSame() throws Exception {
|
||||
byte[] data = new byte[100000];
|
||||
Arrays.fill(data, (byte) 123);
|
||||
testIdentity(data);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testSequential() throws Exception {
|
||||
byte[] data = new byte[49];
|
||||
for (int i = 0; i < data.length; i++) {
|
||||
data[i] = (byte) i;
|
||||
}
|
||||
testIdentity(data);
|
||||
}
|
||||
|
||||
private static void testIdentity(byte[] data) {
|
||||
ByteBuf in = Unpooled.wrappedBuffer(data);
|
||||
EmbeddedChannel encoder = new EmbeddedChannel(new LzfEncoder());
|
||||
EmbeddedChannel decoder = new EmbeddedChannel(new LzfDecoder());
|
||||
try {
|
||||
ByteBuf msg;
|
||||
|
||||
encoder.writeOutbound(in.copy());
|
||||
encoder.finish();
|
||||
CompositeByteBuf compressed = Unpooled.compositeBuffer();
|
||||
while ((msg = encoder.readOutbound()) != null) {
|
||||
compressed.addComponent(msg);
|
||||
compressed.writerIndex(compressed.writerIndex() + msg.readableBytes());
|
||||
}
|
||||
assertThat(compressed, is(notNullValue()));
|
||||
|
||||
decoder.writeInbound(compressed.retain());
|
||||
assertFalse(compressed.isReadable());
|
||||
CompositeByteBuf decompressed = Unpooled.compositeBuffer();
|
||||
while ((msg = decoder.readInbound()) != null) {
|
||||
decompressed.addComponent(msg);
|
||||
decompressed.writerIndex(decompressed.writerIndex() + msg.readableBytes());
|
||||
}
|
||||
assertEquals(in, decompressed);
|
||||
|
||||
compressed.release();
|
||||
decompressed.release();
|
||||
in.release();
|
||||
} finally {
|
||||
encoder.close();
|
||||
decoder.close();
|
||||
|
||||
for (;;) {
|
||||
Object msg = encoder.readOutbound();
|
||||
if (msg == null) {
|
||||
break;
|
||||
}
|
||||
ReferenceCountUtil.release(msg);
|
||||
}
|
||||
|
||||
for (;;) {
|
||||
Object msg = decoder.readInbound();
|
||||
if (msg == null) {
|
||||
break;
|
||||
}
|
||||
ReferenceCountUtil.release(msg);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
11
license/LICENSE.compress-lzf.txt
Normal file
11
license/LICENSE.compress-lzf.txt
Normal file
@ -0,0 +1,11 @@
|
||||
Copyright 2009-2010 Ning, Inc.
|
||||
|
||||
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 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.
|
Loading…
Reference in New Issue
Block a user