Android CRC-CCITT(XMODEM)（循环冗余校验）

最新推荐文章于 2025-07-09 12:59:17 发布

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#CRC #XMODEM #循环冗余校验 #16进制转字符串

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本文详细介绍了CRC（循环冗余校验）中CCITT(XMODEM)模式的计算方法，包括查表法和计算法，并提供了16进制字符串与byte数组相互转换的实用代码。适用于开发与服务端SOCKET通讯过程中的CRC校验需求。

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    开发与服务端SOCKET通讯的过程中遇到 CRC（循环冗余校验）采用 CCITT(XMODEM)模式这里做一下记录，附上查询与计算两种方式，以及16进制与字符串相互转换的方法。
public class AndroidService {

/**
 * 模拟服务器  可直接运行
 * 
 */


static final char TABLE1021[] = { /* CRC1021余式表 */
        0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 0x8108,
        0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231,
        0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 0x9339,
        0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 0x2462,
        0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a,
        0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, 0x3653,
        0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, 0xb75b,
        0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4,
        0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, 0xc9cc,
        0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 0x5af5,
        0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd,
        0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 0x6ca6,
        0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 0xedae,
        0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97,
        0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, 0xff9f,
        0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, 0x9188,
        0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080,
        0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, 0x83b9,
        0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 0x02b1,
        0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea,
        0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 0x34e2,
        0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xa7db,
        0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3,
        0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, 0xd94c,
        0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, 0x5844,
        0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d,
        0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, 0x4a75,
        0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, 0xfd2e,
        0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26,
        0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 0xef1f,
        0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 0x6e17,
        0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 };





    /**
     * 将16进制字符串转换为byte[]
     * FE0099CF010A01005243FE
     *
     * @param str
     * @return
     */

    public static byte[] toBytes(String str) {
        if (str == null || str.trim().equals("")) {
            return new byte[0];
        }

        byte[] bytes = new byte[str.length() / 2];
        for (int i = 0; i < str.length() / 2; i++) {
            String subStr = str.substring(i * 2, i * 2 + 2);
            bytes[i] = (byte) Integer.parseInt(subStr, 16);
        }

//        Log.e("tag1",BytesHexStrTranslate.bytesToHexFun1(bytes)+"");
//        Log.e("tag1111111", bytes + "");
        return bytes;
    }

    public static int CRC_XModem(byte[] bytes){
        int crc = 0x00;          // initial value
        int polynomial = 0x1021;
        for (int index = 0 ; index< bytes.length; index++) {
            byte b = bytes[index];
            for (int i = 0; i < 8; i++) {
                boolean bit = ((b   >> (7-i) & 1) == 1);
                boolean c15 = ((crc >> 15    & 1) == 1);
                crc <<= 1;
                if (c15 ^ bit) crc ^= polynomial;
            }
        }
        crc &= 0xffff;

        System.out.println(crc +"");
        return crc;
    }




    /**
     * 数组转换成十六进制字符串
//     * @param byte[]
     * @return HexString
     */
    public static final String bytesToHexString(byte[] bArray) {
        StringBuffer sb = new StringBuffer(bArray.length);
        String sTemp;
        for (int i = 0; i < bArray.length; i++) {
            sTemp = Integer.toHexString(0xFF & bArray[i]);
            if (sTemp.length() < 2)
                sb.append(0);
            sb.append(sTemp.toUpperCase());
        }
        return sb.toString();
    }



    public static void main(String args[]) {
        byte[] b = new byte[] {
                (byte) 0x2C, (byte) 0x00, (byte) 0xFF, (byte) 0xFE,
                (byte) 0xFE, (byte) 0x04, (byte) 0x00, (byte) 0x00,
                (byte) 0x00, (byte) 0x00 };
//16 进制字符串转byte
        b = toBytes("0099CF010A0100");
        int a = getCRC1021(b, 7);
        System.out.println("查表法:" + a);
        String str = Integer.toHexString(a).toUpperCase();
        System.out.println("十六进制:" + str);
        System.out.println("计算法:" + CRC_XModem(b));
        System.out.println("十六进制:"
                + Integer.toHexString(CRC_XModem(b)).toUpperCase());
    }


    public static char getCRC1021(byte b[], int len) {
        char crc = 0;
        byte hb = 0;
        int j = 0;
        int index;
        while (len-- != 0) {
            hb = (byte) (crc / 256); //以8位二进制数的形式暂存CRC的高8位
            index = ((hb ^ b[j]) & 0xff); //求得所查索引下标
            crc <<= 8; // 左移8位，相当于CRC的低8位乘以
            crc ^= (TABLE1021[index]); // 高8位和当前字节相加后再查表求CRC ，再加上以前的CRC
            j++;
        }
        return (crc);
    }
}

转换工具类
public class HexUtils {


    /**
     * 字符串转换成十六进制字符串
     */
    public static String str2HexStr(String str) {
        char[] chars = "0123456789ABCDEF".toCharArray();
        StringBuilder sb = new StringBuilder("");
        byte[] bs = str.getBytes();
        int bit;
        for (int i = 0; i < bs.length; i++) {
            bit = (bs[i] & 0x0f0) >> 4;
            sb.append(chars[bit]);
            bit = bs[i] & 0x0f;
            sb.append(chars[bit]);
        }
        return sb.toString();
    }



//    十六进制字符串转换成为数组方法1：

    /**
     * 把16进制字符串转换成字节数组
//     * @param hexString
     * @return byte[]
     */
    public static byte[] hexStringToByte(String hex) {
        int len = (hex.length() / 2);
        byte[] result = new byte[len];
        char[] achar = hex.toCharArray();
        for (int i = 0; i < len; i++) {
            int pos = i * 2;
            result[i] = (byte) (toByte(achar[pos]) << 4 | toByte(achar[pos + 1]));
        }
        return result;
    }

    private static int toByte(char c) {
        byte b = (byte) "0123456789ABCDEF".indexOf(c);
        return b;
    }

//    数组转换成十六进制字符串方法1：

    /**
     * 数组转换成十六进制字符串
//     * @param byte[]
     * @return HexString
     */
    public static final String bytesToHexString(byte[] bArray) {
        StringBuffer sb = new StringBuffer(bArray.length);
        String sTemp;
        for (int i = 0; i < bArray.length; i++) {
            sTemp = Integer.toHexString(0xFF & bArray[i]);
            if (sTemp.length() < 2)
                sb.append(0);
            sb.append(sTemp.toUpperCase());
        }
        return sb.toString();
    }

//    byte[]数组转换成十六进制字符串方法2：

    /**
     * 数组转成十六进制字符串
//     * @param byte[]
     * @return HexString
     */
    public static String toHexString1(byte[] b){
        StringBuffer buffer = new StringBuffer();
        for (int i = 0; i < b.length; ++i){
            buffer.append(toHexString1(b[i]));
        }
        return buffer.toString();
    }
    public static String toHexString1(byte b){
        String s = Integer.toHexString(b & 0xFF);
        if (s.length() == 1){
            return "0" + s;
        }else{
            return s;
        }
    }

//    十六进制字符串转换字符串方法1：

    /**
     * 十六进制字符串转换成字符串
//     * @param hexString
     * @return String
     */
    public static String hexStr2Str(String hexStr) {

        String str = "0123456789ABCDEF";
        char[] hexs = hexStr.toCharArray();
        byte[] bytes = new byte[hexStr.length() / 2];
        int n;
        for (int i = 0; i < bytes.length; i++) {
            n = str.indexOf(hexs[2 * i]) * 16;
            n += str.indexOf(hexs[2 * i + 1]);
            bytes[i] = (byte) (n & 0xff);
        }
        return new String(bytes);
    }



//    十六进制字符串转换字符串方法2：

    /**
     * 十六进制字符串转换字符串
//     * @param HexString
     * @return String
     */
    public static String toStringHex(String s) {
        byte[] baKeyword = new byte[s.length() / 2];
        for (int i = 0; i < baKeyword.length; i++) {
            try {
                baKeyword[i] = (byte) (0xff & Integer.parseInt(s.substring(
                        i * 2, i * 2 + 2), 16));
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        try {
            s = new String(baKeyword, "utf-8");// UTF-16le:Not
        } catch (Exception e1) {
            e1.printStackTrace();
        }
        return s;
    }

 public static void main(String[] args) {

        //定义一个十进制值
        int valueTen = 10080001;
        //将其转换为十六进制并输出
        String strHex = Integer.toHexString(valueTen).toUpperCase();
        System.out.println(valueTen + " [十进制]---->[十六进制] " + strHex);
        //将十六进制格式化输出
        String strHex2 = String.format("%08x",valueTen).toUpperCase();
        System.out.println(valueTen + " [十进制]---->[十六进制] " + strHex2);

        System.out.println("==========================================================");
        //定义一个十六进制值
        String strHex3 = "00001322";
        //将十六进制转化成十进制
        int valueTen2 = Integer.parseInt(strHex3,16);
        System.out.println(strHex3 + " [十六进制]---->[十进制] " + valueTen2);

        System.out.println("==========================================================");
        //可以在声明十进制时，自动完成十六进制到十进制的转换
        int valueHex = 0x00001322;
        System.out.println("int valueHex = 0x00001322 --> " + valueHex);
    }
}


}
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