【Java】CRC16Utils（CRC-16 工具类）

Java CRC-16 工具类

/**
 * CRC-16
 * 
 * <table width="400px" border="1" cellpadding="0" cellspacing="0">
 *     <tr>
 *         <th>名称</th>
 *         <th>多项式</th>
 *         <th>初始值</th>
 *         <th>异或值</th>
 *         <th>Bit反转</th>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-16/IBM</td>
 *         <td align="center">0x8005</td>
 *         <td align="center">0x0000</td>
 *         <td align="center">0x0000</td>
 *         <td align="center">LSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-16/CCITT</td>
 *         <td align="center">0x1021</td>
 *         <td align="center">0x0000</td>
 *         <td align="center">0x0000</td>
 *         <td align="center">LSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-16/CCITT-FALSE</td>
 *         <td align="center">0x1021</td>
 *         <td align="center">0xFFFF</td>
 *         <td align="center">0x0000</td>
 *         <td align="center">MSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-16/DECT R</td>
 *         <td align="center">0x0589</td>
 *         <td align="center">0x0000</td>
 *         <td align="center">0x0001</td>
 *         <td align="center">MSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-16/DECT X</td>
 *         <td align="center">0x0589</td>
 *         <td align="center">0x0000</td>
 *         <td align="center">0x0000</td>
 *         <td align="center">MSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-16/DNP</td>
 *         <td align="center">0x3D65</td>
 *         <td align="center">0x0000</td>
 *         <td align="center">0xFFFF</td>
 *         <td align="center">LSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-16/GENIBUS</td>
 *         <td align="center">0x1021</td>
 *         <td align="center">0xFFFF</td>
 *         <td align="center">0xFFFF</td>
 *         <td align="center">MSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-16/MAXIM</td>
 *         <td align="center">0x8005</td>
 *         <td align="center">0x0000</td>
 *         <td align="center">0xFFFF</td>
 *         <td align="center">LSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-16/MODBUS</td>
 *         <td align="center">0x8005</td>
 *         <td align="center">0xFFFF</td>
 *         <td align="center">0x0000</td>
 *         <td align="center">LSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-16/USB</td>
 *         <td align="center">0x8005</td>
 *         <td align="center">0xFFFF</td>
 *         <td align="center">0xFFFF</td>
 *         <td align="center">LSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-16/X25</td>
 *         <td align="center">0x1021</td>
 *         <td align="center">0xFFFF</td>
 *         <td align="center">0xFFFF</td>
 *         <td align="center">LSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-16/XMODEM</td>
 *         <td align="center">0x1021</td>
 *         <td align="center">0x0000</td>
 *         <td align="center">0x0000</td>
 *         <td align="center">MSB First</td>
 *     </tr>
 * </table>
 * 
 * @author unnamed
 *
 */
public class CRC16Utils {

    /**
     * CRC-16/IBM
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x8005</td>
     *         <td align="center">0x0000</td>
     *         <td align="center">0x0000</td>
     *         <td align="center">LSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static int CRC16_IBM(byte[] source, int offset, int length) {
        int wCRCin = 0x0000;
        // Integer.reverse(0x8005) >>> 16
        int wCPoly = 0xA001;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            wCRCin ^= ((int) source[i] & 0x00FF);
            for (int j = 0; j < 8; j++) {
                if ((wCRCin & 0x0001) != 0) {
                    wCRCin >>= 1;
                    wCRCin ^= wCPoly;
                } else {
                    wCRCin >>= 1;
                }
            }
        }
        return wCRCin ^= 0x0000;
    }

    /**
     * CRC-16/CCITT
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x1021</td>
     *         <td align="center">0x0000</td>
     *         <td align="center">0x0000</td>
     *         <td align="center">LSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static int CRC16_CCITT(byte[] source, int offset, int length) {
        int wCRCin = 0x0000;
        // Integer.reverse(0x1021) >>> 16
        int wCPoly = 0x8408;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            wCRCin ^= ((int) source[i] & 0x00FF);
            for (int j = 0; j < 8; j++) {
                if ((wCRCin & 0x0001) != 0) {
                    wCRCin >>= 1;
                    wCRCin ^= wCPoly;
                } else {
                    wCRCin >>= 1;
                }
            }
        }
        return wCRCin ^= 0x0000;
    }

    /**
     * CRC-16/CCITT-FALSE
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x1021</td>
     *         <td align="center">0xFFFF</td>
     *         <td align="center">0x0000</td>
     *         <td align="center">MSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static int CRC16_CCITT_FALSE(byte[] source, int offset, int length) {
        int wCRCin = 0xFFFF;
        int wCPoly = 0x1021;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            for (int j = 0; j < 8; j++) {
                boolean bit = ((source[i] >> (7 - j) & 1) == 1);
                boolean c15 = ((wCRCin >> 15 & 1) == 1);
                wCRCin <<= 1;
                if (c15 ^ bit)
                    wCRCin ^= wCPoly;
            }
        }
        wCRCin &= 0xFFFF;
        return wCRCin ^= 0x0000;
    }

    /**
     * CRC-16/DECT R
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x0589</td>
     *         <td align="center">0x0000</td>
     *         <td align="center">0x0001</td>
     *         <td align="center">MSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static int CRC16_DECT_R(byte[] source, int offset, int length) {
        int wCRCin = 0x0000;
        int wCPoly = 0x0589;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            for (int j = 0; j < 8; j++) {
                boolean bit = ((source[i] >> (7 - j) & 1) == 1);
                boolean c15 = ((wCRCin >> 15 & 1) == 1);
                wCRCin <<= 1;
                if (c15 ^ bit)
                    wCRCin ^= wCPoly;
            }
        }
        wCRCin &= 0xFFFF;
        return wCRCin ^= 0x0001;
    }

    /**
     * CRC-16/DECT X
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x0589</td>
     *         <td align="center">0x0000</td>
     *         <td align="center">0x0000</td>
     *         <td align="center">MSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static int CRC16_DECT_X(byte[] source, int offset, int length) {
        int wCRCin = 0x0000;
        int wCPoly = 0x0589;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            for (int j = 0; j < 8; j++) {
                boolean bit = ((source[i] >> (7 - j) & 1) == 1);
                boolean c15 = ((wCRCin >> 15 & 1) == 1);
                wCRCin <<= 1;
                if (c15 ^ bit)
                    wCRCin ^= wCPoly;
            }
        }
        wCRCin &= 0xFFFF;
        return wCRCin ^= 0x0000;
    }

    /**
     * CRC-16/DNP
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x3D65</td>
     *         <td align="center">0x0000</td>
     *         <td align="center">0xFFFF</td>
     *         <td align="center">LSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static int CRC16_DNP(byte[] source, int offset, int length) {
        int wCRCin = 0x0000;
        // Integer.reverse(0x3D65) >>> 16
        int wCPoly = 0xA6BC;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            wCRCin ^= ((int) source[i] & 0x00FF);
            for (int j = 0; j < 8; j++) {
                if ((wCRCin & 0x0001) != 0) {
                    wCRCin >>= 1;
                    wCRCin ^= wCPoly;
                } else {
                    wCRCin >>= 1;
                }
            }
        }
        return wCRCin ^= 0xFFFF;
    }

    /**
     * CRC-16/GENIBUS
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x1021</td>
     *         <td align="center">0xFFFF</td>
     *         <td align="center">0xFFFF</td>
     *         <td align="center">MSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static int CRC16_GENIBUS(byte[] source, int offset, int length) {
        int wCRCin = 0xFFFF;
        int wCPoly = 0x1021;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            for (int j = 0; j < 8; j++) {
                boolean bit = ((source[i] >> (7 - j) & 1) == 1);
                boolean c15 = ((wCRCin >> 15 & 1) == 1);
                wCRCin <<= 1;
                if (c15 ^ bit)
                    wCRCin ^= wCPoly;
            }
        }
        wCRCin &= 0xFFFF;
        return wCRCin ^= 0xFFFF;
    }

    /**
     * CRC-16/MAXIM
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x8005</td>
     *         <td align="center">0x0000</td>
     *         <td align="center">0xFFFF</td>
     *         <td align="center">LSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static int CRC16_MAXIM(byte[] source, int offset, int length) {
        int wCRCin = 0x0000;
        // Integer.reverse(0x8005) >>> 16
        int wCPoly = 0xA001;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            wCRCin ^= ((int) source[i] & 0x00FF);
            for (int j = 0; j < 8; j++) {
                if ((wCRCin & 0x0001) != 0) {
                    wCRCin >>= 1;
                    wCRCin ^= wCPoly;
                } else {
                    wCRCin >>= 1;
                }
            }
        }
        return wCRCin ^= 0xFFFF;
    }

    /**
     * CRC-16/MODBUS
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x8005</td>
     *         <td align="center">0xFFFF</td>
     *         <td align="center">0x0000</td>
     *         <td align="center">LSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static int CRC16_MODBUS(byte[] source, int offset, int length) {
        int wCRCin = 0xFFFF;
        // Integer.reverse(0x8005) >>> 16
        int wCPoly = 0xA001;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            wCRCin ^= ((int) source[i] & 0x00FF);
            for (int j = 0; j < 8; j++) {
                if ((wCRCin & 0x0001) != 0) {
                    wCRCin >>= 1;
                    wCRCin ^= wCPoly;
                } else {
                    wCRCin >>= 1;
                }
            }
        }
        return wCRCin ^= 0x0000;
    }

    /**
     * CRC-16/USB
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x8005</td>
     *         <td align="center">0xFFFF</td>
     *         <td align="center">0xFFFF</td>
     *         <td align="center">LSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static int CRC16_USB(byte[] source, int offset, int length) {
        int wCRCin = 0xFFFF;
        // Integer.reverse(0x8005) >>> 16
        int wCPoly = 0xA001;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            wCRCin ^= ((int) source[i] & 0x00FF);
            for (int j = 0; j < 8; j++) {
                if ((wCRCin & 0x0001) != 0) {
                    wCRCin >>= 1;
                    wCRCin ^= wCPoly;
                } else {
                    wCRCin >>= 1;
                }
            }
        }
        return wCRCin ^= 0xFFFF;
    }

    /**
     * CRC-16/X25
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x1021</td>
     *         <td align="center">0xFFFF</td>
     *         <td align="center">0xFFFF</td>
     *         <td align="center">LSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static int CRC16_X25(byte[] source, int offset, int length) {
        int wCRCin = 0xFFFF;
        // Integer.reverse(0x1021) >>> 16
        int wCPoly = 0x8408;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            wCRCin ^= ((int) source[i] & 0x00FF);
            for (int j = 0; j < 8; j++) {
                if ((wCRCin & 0x0001) != 0) {
                    wCRCin >>= 1;
                    wCRCin ^= wCPoly;
                } else {
                    wCRCin >>= 1;
                }
            }
        }
        return wCRCin ^= 0xFFFF;
    }

    /**
     * CRC-16/XMODEM
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x1021</td>
     *         <td align="center">0x0000</td>
     *         <td align="center">0x0000</td>
     *         <td align="center">MSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static int CRC16_XMODEM(byte[] source, int offset, int length) {
        int wCRCin = 0x0000;
        int wCPoly = 0x1021;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            for (int j = 0; j < 8; j++) {
                boolean bit = ((source[i] >> (7 - j) & 1) == 1);
                boolean c15 = ((wCRCin >> 15 & 1) == 1);
                wCRCin <<= 1;
                if (c15 ^ bit)
                    wCRCin ^= wCPoly;
            }
        }
        wCRCin &= 0xFFFF;
        return wCRCin ^= 0x0000;
    }

}