【Java】CRC16Utils（CRC-16 工具类）

Java CRC-16 工具类

/**
 * CRC-16
 * 
 * 
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名称
多项式
初始值
异或值
Bit反转
  CRC-16/IBM
0x8005
0x0000
0x0000
LSB First
  CRC-16/CCITT
0x1021
0x0000
0x0000
LSB First
  CRC-16/CCITT-FALSE
0x1021
0xFFFF
0x0000
MSB First
  CRC-16/DECT R
0x0589
0x0000
0x0001
MSB First
  CRC-16/DECT X
0x0589
0x0000
0x0000
MSB First
  CRC-16/DNP
0x3D65
0x0000
0xFFFF
LSB First
  CRC-16/GENIBUS
0x1021
0xFFFF
0xFFFF
MSB First
  CRC-16/MAXIM
0x8005
0x0000
0xFFFF
LSB First
  CRC-16/MODBUS
0x8005
0xFFFF
0x0000
LSB First
  CRC-16/USB
0x8005
0xFFFF
0xFFFF
LSB First
  CRC-16/X25
0x1021
0xFFFF
0xFFFF
LSB First
  CRC-16/XMODEM
0x1021
0x0000
0x0000
MSB First
 * 
 * @author unnamed
 *
 */
public class CRC16Utils {

    /**
     * CRC-16/IBM
     * 
     * 
     *     
     *         
     *         
     *         
     *         
     *     
     *     
     *         
     *         
     *         
     *         
     *     
     * 
多项式
初始值
异或值
Bit反转
0x8005
0x0000
0x0000
LSB First
     * 
     * @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
     * 
     * 
     *     
     *         
     *         
     *         
     *         
     *     
     *     
     *         
     *         
     *         
     *         
     *     
     * 
多项式
初始值
异或值
Bit反转
0x1021
0x0000
0x0000
LSB First
     * 
     * @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
     * 
     * 
     *     
     *         
     *         
     *         
     *         
     *     
     *     
     *         
     *         
     *         
     *         
     *     
     * 
多项式
初始值
异或值
Bit反转
0x1021
0xFFFF
0x0000
MSB First
     * 
     * @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
     * 
     * 
     *     
     *         
     *         
     *         
     *         
     *     
     *     
     *         
     *         
     *         
     *         
     *     
     * 
多项式
初始值
异或值
Bit反转
0x0589
0x0000
0x0001
MSB First
     * 
     * @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
     * 
     * 
     *     
     *         
     *         
     *         
     *         
     *     
     *     
     *         
     *         
     *         
     *         
     *     
     * 
多项式
初始值
异或值
Bit反转
0x0589
0x0000
0x0000
MSB First
     * 
     * @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
     * 
     * 
     *     
     *         
     *         
     *         
     *         
     *     
     *     
     *         
     *         
     *         
     *         
     *     
     * 
多项式
初始值
异或值
Bit反转
0x3D65
0x0000
0xFFFF
LSB First
     * 
     * @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
     * 
     * 
     *     
     *         
     *         
     *         
     *         
     *     
     *     
     *         
     *         
     *         
     *         
     *     
     * 
多项式
初始值
异或值
Bit反转
0x1021
0xFFFF
0xFFFF
MSB First
     * 
     * @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
     * 
     * 
     *     
     *         
     *         
     *         
     *         
     *     
     *     
     *         
     *         
     *         
     *         
     *     
     * 
多项式
初始值
异或值
Bit反转
0x8005
0x0000
0xFFFF
LSB First
     * 
     * @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
     * 
     * 
     *     
     *         
     *         
     *         
     *         
     *     
     *     
     *         
     *         
     *         
     *         
     *     
     * 
多项式
初始值
异或值
Bit反转
0x8005
0xFFFF
0x0000
LSB First
     * 
     * @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
     * 
     * 
     *     
     *         
     *         
     *         
     *         
     *     
     *     
     *         
     *         
     *         
     *         
     *     
     * 
多项式
初始值
异或值
Bit反转
0x8005
0xFFFF
0xFFFF
LSB First
     * 
     * @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
     * 
     * 
     *     
     *         
     *         
     *         
     *         
     *     
     *     
     *         
     *         
     *         
     *         
     *     
     * 
多项式
初始值
异或值
Bit反转
0x1021
0xFFFF
0xFFFF
LSB First
     * 
     * @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
     * 
     * 
     *     
     *         
     *         
     *         
     *         
     *     
     *     
     *         
     *         
     *         
     *         
     *     
     * 
多项式
初始值
异或值
Bit反转
0x1021
0x0000
0x0000
MSB First
     * 
     * @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;
    }

}