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ivancai
V2EX  ›  程序员

有写 C 语言的大佬可以帮忙把这个函数转成 Java 的实现吗

  •  
  •   ivancai · 2020-06-21 19:25:23 +08:00 · 3413 次点击
    这是一个创建于 1634 天前的主题,其中的信息可能已经有所发展或是发生改变。
    WORD ModbusCRC(BYTE * pData, BYTE len)
    {
    BYTE byCRCHi = 0xff;
    BYTE byCRCLo = 0xff;
    BYTE byIdx;
    WORD crc;
    while(len--)
    {
    byIdx = byCRCHi ^* pData++;
    byCRCHi = byCRCLo ^ gabyCRCHi[byIdx];
    byCRCLo = gabyCRCLo[byIdx];
    }
    crc = byCRCHi;
    crc <<= 8;
    crc += byCRCLo;
    return crc;
    }
    BYTE gabyCRCHi[] =
    {
    0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x01,0xc0,
    0x80,0x41,0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,
    0x00,0xc1,0x81,0x40,0x00,0xc1,0x81,0x40,0x01,0xc0,
    0x80,0x41,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,
    0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x00,0xc1,
    0x81,0x40,0x01,0xc0,0x80,0x41,0x01,0xc0,0x80,0x41,
    0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x00,0xc1,
    0x81,0x40,0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,
    0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x01,0xc0,
    0x80,0x41,0x00,0xc1,0x81,0x40,0x00,0xc1,0x81,0x40,
    0x01,0xc0,0x80,0x41,0x01,0xc0,0x80,0x41,0x00,0xc1,
    0x81,0x40,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,
    0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x01,0xc0,
    0x80,0x41,0x00,0xc1,0x81,0x40,0x00,0xc1,0x81,0x40,
    0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,0x01,0xc0,
    0x80,0x41,0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,
    0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x01,0xc0,
    0x80,0x41,0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,
    0x00,0xc1,0x81,0x40,0x00,0xc1,0x81,0x40,0x01,0xc0,
    0x80,0x41,0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,
    0x01,0xc0,0x80,0x41,0x00,0xc1,0x81,0x40,0x01,0xc0,
    0x80,0x41,0x00,0xc1,0x81,0x40,0x00,0xc1,0x81,0x40,
    0x01,0xc0,0x80,0x41,0x01,0xc0,0x80,0x41,0x00,0xc1,
    0x81,0x40,0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,
    0x00,0xc1,0x81,0x40,0x01,0xc0,0x80,0x41,0x01,0xc0,
    0x80,0x41,0x00,0xc1,0x81,0x40

    };

    BYTE gabyCRCLo[] =
    {
    0x00,0xc0,0xc1,0x01,0xc3,0x03,0x02,0xc2,0xc6,0x06,
    0x07,0xc7,0x05,0xc5,0xc4,0x04,0xcc,0x0c,0x0d,0xcd,
    0x0f,0xcf,0xce,0x0e,0x0a,0xca,0xcb,0x0b,0xc9,0x09,
    0x08,0xc8,0xd8,0x18,0x19,0xd9,0x1b,0xdb,0xda,0x1a,
    0x1e,0xde,0xdf,0x1f,0xdd,0x1d,0x1c,0xdc,0x14,0xd4,
    0xd5,0x15,0xd7,0x17,0x16,0xd6,0xd2,0x12,0x13,0xd3,
    0x11,0xd1,0xd0,0x10,0xf0,0x30,0x31,0xf1,0x33,0xf3,
    0xf2,0x32,0x36,0xf6,0xf7,0x37,0xf5,0x35,0x34,0xf4,
    0x3c,0xfc,0xfd,0x3d,0xff,0x3f,0x3e,0xfe,0xfa,0x3a,
    0x3b,0xfb,0x39,0xf9,0xf8,0x38,0x28,0xe8,0xe9,0x29,
    0xeb,0x2b,0x2a,0xea,0xee,0x2e,0x2f,0xef,0x2d,0xed,
    0xec,0x2c,0xe4,0x24,0x25,0xe5,0x27,0xe7,0xe6,0x26,
    0x22,0xe2,0xe3,0x23,0xe1,0x21,0x20,0xe0,0xa0,0x60,
    0x61,0xa1,0x63,0xa3,0xa2,0x62,0x66,0xa6,0xa7,0x67,
    0xa5,0x65,0x64,0xa4,0x6c,0xac,0xad,0x6d,0xaf,0x6f,
    0x6e,0xae,0xaa,0x6a,0x6b,0xab,0x69,0xa9,0xa8,0x68,
    0x78,0xb8,0xb9,0x79,0xbb,0x7b,0x7a,0xba,0xbe,0x7e,
    0x7f,0xbf,0x7d,0xbd,0xbc,0x7c,0xb4,0x74,0x75,0xb5,
    0x77,0xb7,0xb6,0x76,0x72,0xb2,0xb3,0x73,0xb1,0x71,
    0x70,0xb0,0x50,0x90,0x91,0x51,0x93,0x53,0x52,0x92,
    0x96,0x56,0x57,0x97,0x55,0x95,0x94,0x54,0x9c,0x5c,
    0x5d,0x9d,0x5f,0x9f,0x9e,0x5e,0x5a,0x9a,0x9b,0x5b,
    0x99,0x59,0x58,0x98,0x88,0x48,0x49,0x89,0x4b,0x8b,
    0x8a,0x4a,0x4e,0x8e,0x8f,0x4f,0x8d,0x4d,0x4c,0x8c,
    0x44,0x84,0x85,0x45,0x87,0x47,0x46,0x86,0x82,0x42,
    0x43,0x83,0x41,0x81,0x80,0x40
    };
    9 条回复    2020-06-22 11:05:17 +08:00
    zhujian198
        1
    zhujian198  
       2020-06-21 20:03:52 +08:00
    github 搜索下就有了
    justin2018
        2
    justin2018  
       2020-06-21 20:07:16 +08:00
    ![SEuARj8]( )
    Harv
        3
    Harv  
       2020-06-21 20:13:07 +08:00
    给你几个关键词你去搜下:CRC16 MODBUS 标准 查表法 java 实现
    xdtr
        4
    xdtr  
       2020-06-21 21:00:36 +08:00
    查表法计算 crc 嘛。函数参数里*pData 是需要计算 crc 的数组,len 是数组长度。
    * pData++ 是说从 pData 取数据并将下标前进一个字节。
    其他的就没啥好说的啦,查表后异或运算。
    waruqi
        5
    waruqi  
       2020-06-21 21:02:49 +08:00
    我觉得你这得问 java 大佬~
    oneisall8955
        6
    oneisall8955  
       2020-06-21 21:31:50 +08:00 via Android
    JAVA CRC 算法实现?看这个表很熟悉的感觉,以前实习时候用过,貌似用于校验数据完整性
    ivancai
        7
    ivancai  
    OP
       2020-06-21 22:32:19 +08:00
    谢谢各位,解决了!
    shawndev
        8
    shawndev  
       2020-06-22 10:26:02 +08:00
    之前一样的代码,需求是 java 重写到 c 。
    jimmyismagic
        9
    jimmyismagic  
       2020-06-22 11:05:17 +08:00
    可以用 jni 啊,还快
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