有写 C 语言的大佬可以帮忙把这个函数转成 Java 的实现吗 - V2EX
V2EX = way to explore
V2EX 是一个关于分享和探索的地方
现在注册
已注册用户请  登录
请不要在回答技术问题时复制粘贴 AI 生成的内容
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 3988 次点击
    这是一个创建于 2017 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~
    itechify
        6
    itechify  
    PRO
       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
    关于     帮助文档     自助推广系统     博客     API     FAQ     Solana     931 人在线   最高记录 6679       Select Language
    创意工作者们的社区
    World is powered by solitude
    VERSION: 3.9.8.5 22ms UTC 22:44 PVG 06:44 LAX 14:44 JFK 17:44
    Do have faith in what you're doing.
    ubao msn snddm index pchome yahoo rakuten mypaper meadowduck bidyahoo youbao zxmzxm asda bnvcg cvbfg dfscv mmhjk xxddc yybgb zznbn ccubao uaitu acv GXCV ET GDG YH FG BCVB FJFH CBRE CBC GDG ET54 WRWR RWER WREW WRWER RWER SDG EW SF DSFSF fbbs ubao fhd dfg ewr dg df ewwr ewwr et ruyut utut dfg fgd gdfgt etg dfgt dfgd ert4 gd fgg wr 235 wer3 we vsdf sdf gdf ert xcv sdf rwer hfd dfg cvb rwf afb dfh jgh bmn lgh rty gfds cxv xcv xcs vdas fdf fgd cv sdf tert sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf shasha9178 shasha9178 shasha9178 shasha9178 shasha9178 liflif2 liflif2 liflif2 liflif2 liflif2 liblib3 liblib3 liblib3 liblib3 liblib3 zhazha444 zhazha444 zhazha444 zhazha444 zhazha444 dende5 dende denden denden2 denden21 fenfen9 fenf619 fen619 fenfe9 fe619 sdf sdf sdf sdf sdf zhazh90 zhazh0 zhaa50 zha90 zh590 zho zhoz zhozh zhozho zhozho2 lislis lls95 lili95 lils5 liss9 sdf0ty987 sdft876 sdft9876 sdf09876 sd0t9876 sdf0ty98 sdf0976 sdf0ty986 sdf0ty96 sdf0t76 sdf0876 df0ty98 sf0t876 sd0ty76 sdy76 sdf76 sdf0t76 sdf0ty9 sdf0ty98 sdf0ty987 sdf0ty98 sdf6676 sdf876 sd876 sd876 sdf6 sdf6 sdf9876 sdf0t sdf06 sdf0ty9776 sdf0ty9776 sdf0ty76 sdf8876 sdf0t sd6 sdf06 s688876 sd688 sdf86