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