/*
* @(#)$Id$
*
* Copyright 2006-2008 Makoto YUI
*
* 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.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.util.compress;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Random;
import junit.framework.TestCase;
import junitx.framework.ArrayAssert;
import xbird.util.compress.LZSSCodec;
import xbird.util.io.FastMultiByteArrayOutputStream;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public class LZSSCodecTest extends TestCase {
public LZSSCodecTest(String name) {
super(name);
}
public void test1() {
probe("aabbbcbbbb".getBytes());
}
public void test2() {
probe("asasdfdfagfffffaerawefgsgsdffffgvsdfgsgfsgfgweffvsregsrevsdfsagghhawdfd".getBytes());
}
public void testRand1000() throws IOException {
FastMultiByteArrayOutputStream out = new FastMultiByteArrayOutputStream(4096);
DataOutputStream data = new DataOutputStream(out);
Random rand = new Random(22222);
for(int times = 0; times < 3; times++) {
for(int i = 0; i < 1000; i++) {
data.writeInt(rand.nextInt());
}
probe(out.toByteArray_clear());
}
}
public void testRand10000() throws IOException {
FastMultiByteArrayOutputStream out = new FastMultiByteArrayOutputStream(4096);
DataOutputStream data = new DataOutputStream(out);
Random rand = new Random(44444);
for(int times = 0; times < 3; times++) {
for(int i = 0; i < 10000; i++) {
data.writeInt(rand.nextInt());
}
probe(out.toByteArray_clear());
}
}
public void testRandGaussian10000() throws IOException {
FastMultiByteArrayOutputStream out = new FastMultiByteArrayOutputStream(4096);
DataOutputStream data = new DataOutputStream(out);
Random rand = new Random(3333);
for(int times = 0; times < 3; times++) {
for(int i = 0; i < 10000; i++) {
data.writeDouble(rand.nextGaussian());
}
probe(out.toByteArray_clear());
}
}
public void probe(byte[] input) {
LZSSCodec codec = new LZSSCodec();
byte[] compressed = codec.compress(input);
byte[] decompressed = codec.decompress(compressed);
ArrayAssert.assertEquals(input, decompressed);
float ratio = (float) compressed.length / (float) input.length;
System.out.println("Original: " + input.length + ", Compressed: " + compressed.length
+ ", Compression ratio: " + Float.toString(ratio * 100.0f));
}
}