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package org.traccar.helper;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.junit.Assert;
import org.junit.Test;
import java.nio.charset.StandardCharsets;
public class ChecksumTest {
@Test
public void testCrc16() {
ChannelBuffer buf = ChannelBuffers.copiedBuffer("123456789", StandardCharsets.US_ASCII);
Assert.assertEquals(0x906e, Checksum.crc16(Checksum.CRC16_X25, buf.toByteBuffer()));
Assert.assertEquals(0x29b1, Checksum.crc16(Checksum.CRC16_CCITT_FALSE, buf.toByteBuffer()));
Assert.assertEquals(0x2189, Checksum.crc16(Checksum.CRC16_KERMIT, buf.toByteBuffer()));
Assert.assertEquals(0x31c3, Checksum.crc16(Checksum.CRC16_XMODEM, buf.toByteBuffer()));
Assert.assertEquals(0xe5cc, Checksum.crc16(Checksum.CRC16_AUG_CCITT, buf.toByteBuffer()));
Assert.assertEquals(0xd64e, Checksum.crc16(Checksum.CRC16_GENIBUS, buf.toByteBuffer()));
Assert.assertEquals(0x6f91, Checksum.crc16(Checksum.CRC16_MCRF4XX, buf.toByteBuffer()));
}
@Test
public void testLuhn() {
Assert.assertEquals(7, Checksum.luhn(12345678901234L));
Assert.assertEquals(0, Checksum.luhn(63070019470771L));
}
@Test
public void testModulo256() {
Assert.assertEquals(0x00, Checksum.modulo256(new byte[] {0x00}));
Assert.assertEquals(0x00, Checksum.modulo256(new byte[] {0x00, 0x00, 0x00}));
Assert.assertEquals(0x06, Checksum.modulo256(new byte[] {0x01, 0x02, 0x03}));
}
}
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