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CompressTest.java
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CompressTest.java
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//
// --------------------------------------------------------------------------
// Gurux Ltd
//
//
//
// Filename: $HeadURL$
//
// Version: $Revision$,
// $Date$
// $Author$
//
// Copyright (c) Gurux Ltd
//
//---------------------------------------------------------------------------
//
// DESCRIPTION
//
// This file is a part of Gurux Device Framework.
//
// Gurux Device Framework is Open Source software; you can redistribute it
// and/or modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; version 2 of the License.
// Gurux Device Framework is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// More information of Gurux products: https://www.gurux.org
//
// This code is licensed under the GNU General Public License v2.
// Full text may be retrieved at http://www.gnu.org/licenses/gpl-2.0.txt
//---------------------------------------------------------------------------
package gurux.dlms;
import java.util.ArrayList;
import java.util.List;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
public class CompressTest {
@BeforeClass
public static void setUpClass() {
}
@AfterClass
public static void tearDownClass() {
}
@Before
public final void setUp() {
}
@After
public final void tearDown() {
}
private static class Token {
int offset;
int length;
char nextChar;
Token(int offset, int length, char nextChar) {
this.offset = offset;
this.length = length;
this.nextChar = nextChar;
}
@Override
public String toString() {
return "(" + offset + "," + length + "," + nextChar + ")";
}
}
public static List<Token> compress(String input) {
List<Token> tokens = new ArrayList<>();
int windowSize = 1024;
int i = 0;
while (i < input.length()) {
int maxMatchLength = 0;
int maxMatchOffset = 0;
for (int j = Math.max(0, i - windowSize); j < i; j++) {
int k = j;
int length = 0;
while (k < input.length() && i + length < input.length()
&& input.charAt(k) == input.charAt(i + length)) {
length++;
k++;
}
if (length > maxMatchLength) {
maxMatchLength = length;
maxMatchOffset = i - j;
}
}
if (maxMatchLength > 0) {
tokens.add(new Token(maxMatchOffset, maxMatchLength,
input.charAt(i + maxMatchLength)));
i += maxMatchLength + 1;
} else {
tokens.add(new Token(0, 0, input.charAt(i)));
i++;
}
}
return tokens;
}
/*
* Test byte to hex.
*/
@Test
public final void compressTest() {
String input = "ABABABABABABAB";
List<Token> compressed = compress(input);
// Print compressed tokens
for (Token token : compressed) {
System.out.print(token);
}
}
/*
* Test byte to hex.
*/
@Test
public final void compress2Test() {
String input = "ABCDEXABCDEYABCDE";
List<Token> compressed = compress(input);
// Print compressed tokens
for (Token token : compressed) {
System.out.print(token);
}
}
/*
* Test byte to hex.
*/
@Test
public final void compress3Test() {
String input = "0F 70 53 9C 2D B5 FF 2D B0 C2";
String pdu = "05 C4 02 04 03 60 00 60 E2 01";
List<Token> compressed = compress(input);
// Print compressed tokens
for (Token token : compressed) {
System.out.print(token);
}
}
}