ShrinkItArchive/test_src/com/webcodepro/shrinkit/CRC16Test.java

38 lines
1.2 KiB
Java

package com.webcodepro.shrinkit;
import java.io.UnsupportedEncodingException;
import junit.framework.TestCase;
public class CRC16Test extends TestCase {
public void testTable() {
int[] table = CRC16.getTable();
assertEquals(0, table[0]);
assertEquals(0x1ef0, table[0xff]);
System.out.println("CRC16 lookup table:");
for (int i = 0; i < 256; i++) {
System.out.print(Integer.toHexString(table[i]) + " ");
if ((i + 1) % 8 == 0) System.out.println();
}
}
public void testUpdate() throws UnsupportedEncodingException {
CRC16 crc16 = new CRC16();
crc16.update("123456789".getBytes("UTF-8"));
assertEquals(0x31c3, crc16.getValue());
crc16.update("ABCDEFGHIJKLMNOPQRSTUVWXYZ".getBytes("UTF-8"));
assertEquals(0x92cc, crc16.getValue());
crc16.update("abcdefghijklmnopqrstuvwxyz".getBytes("UTF-8"));
assertEquals(0xfc85, crc16.getValue());
crc16.reset();
crc16.update("xxx123456789xxx".getBytes("UTF-8"), 3, 9);
assertEquals(0x31c3, crc16.getValue());
}
public void testVariousValues() throws UnsupportedEncodingException {
CRC16 crc16 = new CRC16();
byte[] data = new byte[] { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, (byte)0x80 };
crc16.update(data);
assertEquals(0x2299, crc16.getValue());
}
}