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package org.traccar.helper;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import org.junit.Test;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import static org.junit.Assert.assertEquals;
public class ChecksumTest {
@Test
public void testCrc8() {
ByteBuf buf = Unpooled.copiedBuffer("123456789", StandardCharsets.US_ASCII);
assertEquals(0xF7, Checksum.crc8(Checksum.CRC8_EGTS, buf.nioBuffer()));
assertEquals(0xD0, Checksum.crc8(Checksum.CRC8_ROHC, buf.nioBuffer()));
}
@Test
public void testCrc16() {
ByteBuf buf = Unpooled.copiedBuffer("123456789", StandardCharsets.US_ASCII);
assertEquals(0xBB3D, Checksum.crc16(Checksum.CRC16_IBM, buf.nioBuffer()));
assertEquals(0x4B37, Checksum.crc16(Checksum.CRC16_MODBUS, buf.nioBuffer()));
assertEquals(0x906e, Checksum.crc16(Checksum.CRC16_X25, buf.nioBuffer()));
assertEquals(0x29b1, Checksum.crc16(Checksum.CRC16_CCITT_FALSE, buf.nioBuffer()));
assertEquals(0x2189, Checksum.crc16(Checksum.CRC16_KERMIT, buf.nioBuffer()));
assertEquals(0x31c3, Checksum.crc16(Checksum.CRC16_XMODEM, buf.nioBuffer()));
}
@Test
public void testLuhn() {
assertEquals(7, Checksum.luhn(12345678901234L));
assertEquals(0, Checksum.luhn(63070019470771L));
}
@Test
public void testModulo256() {
assertEquals(0x00, Checksum.modulo256(ByteBuffer.wrap(new byte[] {0x00})));
assertEquals(0x00, Checksum.modulo256(ByteBuffer.wrap(new byte[] {0x00, 0x00, 0x00})));
assertEquals(0xca, Checksum.modulo256(ByteBuffer.wrap(new byte[] {0x77, 0x77, 0x77, 0x77, 0x77, 0x77})));
}
}
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