/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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 org.apache.activemq.artemis.util;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.concurrent.atomic.AtomicLong;
import java.util.zip.Deflater;
import org.apache.activemq.artemis.utils.DeflaterReader;
import org.apache.activemq.artemis.utils.InflaterReader;
import org.apache.activemq.artemis.utils.InflaterWriter;
import org.junit.Assert;
import org.junit.Test;
public class CompressionUtilTest extends Assert {
@Test
public void testDeflaterReader() throws Exception {
String inputString = "blahblahblah??blahblahblahblahblah??blablahblah??blablahblah??bla";
byte[] input = inputString.getBytes(StandardCharsets.UTF_8);
ByteArrayInputStream inputStream = new ByteArrayInputStream(input);
AtomicLong counter = new AtomicLong(0);
ArrayList<Integer> zipHolder = new ArrayList<>();
try (DeflaterReader reader = new DeflaterReader(inputStream, counter)) {
int b = reader.read();
while (b != -1) {
zipHolder.add(b);
b = reader.read();
}
}
assertEquals(input.length, counter.get());
byte[] allCompressed = new byte[zipHolder.size()];
for (int i = 0; i < allCompressed.length; i++) {
allCompressed[i] = (byte) zipHolder.get(i).intValue();
}
byte[] output = new byte[30];
Deflater compressor = new Deflater();
compressor.setInput(input);
compressor.finish();
int compressedDataLength = compressor.deflate(output);
compareByteArray(allCompressed, output, compressedDataLength);
}
@Test
public void testDeflaterReader2() throws Exception {
String inputString = "blahblahblah??blahblahblahblahblah??blablahblah??blablahblah??bla";
byte[] input = inputString.getBytes(StandardCharsets.UTF_8);
ByteArrayInputStream inputStream = new ByteArrayInputStream(input);
AtomicLong counter = new AtomicLong(0);
byte[] buffer = new byte[7];
ArrayList<Integer> zipHolder = new ArrayList<>();
try (DeflaterReader reader = new DeflaterReader(inputStream, counter)) {
int n = reader.read(buffer);
while (n != -1) {
for (int i = 0; i < n; i++) {
zipHolder.add((int) buffer[i]);
}
n = reader.read(buffer);
}
}
assertEquals(input.length, counter.get());
byte[] allCompressed = new byte[zipHolder.size()];
for (int i = 0; i < allCompressed.length; i++) {
allCompressed[i] = (byte) zipHolder.get(i).intValue();
}
byte[] output = new byte[30];
Deflater compressor = new Deflater();
compressor.setInput(input);
compressor.finish();
int compressedDataLength = compressor.deflate(output);
compareByteArray(allCompressed, output, compressedDataLength);
}
@Test
public void testInflaterReader() throws Exception {
String inputString = "blahblahblah??blahblahblahblahblah??blablahblah??blablahblah??bla";
byte[] input = inputString.getBytes(StandardCharsets.UTF_8);
byte[] output = new byte[30];
Deflater compressor = new Deflater();
compressor.setInput(input);
compressor.finish();
int compressedDataLength = compressor.deflate(output);
byte[] zipBytes = new byte[compressedDataLength];
System.arraycopy(output, 0, zipBytes, 0, compressedDataLength);
ByteArrayInputStream byteInput = new ByteArrayInputStream(zipBytes);
ArrayList<Integer> holder = new ArrayList<>();
try (InflaterReader inflater = new InflaterReader(byteInput)) {
int read = inflater.read();
while (read != -1) {
holder.add(read);
read = inflater.read();
}
}
byte[] result = new byte[holder.size()];
for (int i = 0; i < result.length; i++) {
result[i] = holder.get(i).byteValue();
}
String txt = new String(result);
assertEquals(inputString, txt);
}
@Test
public void testInflaterWriter() throws Exception {
String inputString = "blahblahblah??blahblahblahblahblah??blablahblah??blablahblah??bla";
byte[] input = inputString.getBytes(StandardCharsets.UTF_8);
byte[] output = new byte[30];
Deflater compressor = new Deflater();
compressor.setInput(input);
compressor.finish();
int compressedDataLength = compressor.deflate(output);
byte[] zipBytes = new byte[compressedDataLength];
System.arraycopy(output, 0, zipBytes, 0, compressedDataLength);
ByteArrayInputStream byteInput = new ByteArrayInputStream(zipBytes);
ByteArrayOutputStream byteOutput = new ByteArrayOutputStream();
byte[] zipBuffer = new byte[12];
try (InflaterWriter writer = new InflaterWriter(byteOutput)) {
int n = byteInput.read(zipBuffer);
while (n > 0) {
writer.write(zipBuffer, 0, n);
n = byteInput.read(zipBuffer);
}
}
byte[] outcome = byteOutput.toByteArray();
String outStr = new String(outcome);
assertEquals(inputString, outStr);
}
private void compareByteArray(byte[] first, byte[] second, int length) {
for (int i = 0; i < length; i++) {
assertEquals(first[i], second[i]);
}
}
}