/*
* 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.internal.ThreadLocalRandom;
import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
import org.junit.Before;
import org.junit.Test;
import java.io.ByteArrayInputStream;
import static io.netty.handler.codec.compression.Bzip2Constants.*;
import static org.junit.Assert.*;
public class Bzip2EncoderTest {
private static final ThreadLocalRandom rand;
private static final byte[] BYTES_SMALL = new byte[256];
private static final byte[] BYTES_LARGE = new byte[MAX_BLOCK_SIZE * BASE_BLOCK_SIZE + 256];
static {
rand = ThreadLocalRandom.current();
rand.nextBytes(BYTES_SMALL);
rand.nextBytes(BYTES_LARGE);
}
private EmbeddedChannel channel;
@Before
public void initChannel() {
channel = new EmbeddedChannel(new Bzip2Encoder(randomBlockSize()));
}
private static void testCompression(final EmbeddedChannel channel, final byte[] data) throws Exception {
ByteBuf in = Unpooled.wrappedBuffer(data);
channel.writeOutbound(in);
channel.finish();
byte[] uncompressed = uncompress(channel, data.length);
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();
byte[] uncompressed = uncompress(channel, data.length);
assertArrayEquals(data, uncompressed);
}
private static byte[] uncompress(EmbeddedChannel channel, int length) 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();
ByteArrayInputStream is = new ByteArrayInputStream(compressed);
BZip2CompressorInputStream bZip2Is = new BZip2CompressorInputStream(is);
byte[] uncompressed = new byte[length];
int remaining = length;
while (remaining > 0) {
int read = bZip2Is.read(uncompressed, length - remaining, remaining);
if (read > 0) {
remaining -= read;
} else {
break;
}
}
assertEquals(-1, bZip2Is.read());
return uncompressed;
}
private static int randomBlockSize() {
return rand.nextInt(MIN_BLOCK_SIZE, MAX_BLOCK_SIZE + 1);
}
}