/*
* 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);
}
}