C
1 #include <stdio.h> 2 3 #define u16 unsigned int 4 #define u8 unsigned char 5 6 u16 CRC16_Check(u8 *Pushdata,u16 length) 7 { 8 u16 Reg_CRC=0xffff; 9 u16 i,j; 10 11 for( i = 0; i<length; i ++) 12 { 13 Reg_CRC^= *Pushdata++; 14 15 for (j = 0; j<8; j++) 16 { 17 if (Reg_CRC & 0x0001){ 18 Reg_CRC=Reg_CRC>>1^0xA001; 19 }else{ 20 Reg_CRC >>=1; 21 } 22 } 23 } 24 return (Reg_CRC); 25 } 26 27 28 int main(void) 29 { 30 printf("%d ",sizeof("crc16test")-1); // length 9 31 printf("%x ",CRC16_Check((u8 *)"crc16test",sizeof("crc16test")-1)); // 2481 32 return 0; 33 }
Python
1 def crc16(x, invert=False): 2 a = 0xFFFF 3 b = 0xA001 4 for byte in x: 5 a ^= ord(byte) 6 for i in range(8): 7 last = a % 2 8 a >>= 1 9 if last == 1: 10 a ^= b 11 s = hex(a).upper() 12 return s[4:6]+s[2:4] if invert == True else s[2:4]+s[4:6] 13 14 if __name__ == '__main__': 15 print(crc16('crc16test')) # crc编码后 2481 16 print(int(crc16('crc16test',16))) # 十进制 9345
VB
1 ' 查表法实现CRC16 2 Private Function CRC16(data() As Byte) As String 3 Dim CRC16Hi As Byte 4 Dim CRC16Lo As Byte 5 CRC16Hi = &HFF 6 CRC16Lo = &HFF 7 Dim i As Integer 8 Dim iIndex As Long 9 For i = 0 To UBound(data) 10 iIndex = CRC16Lo Xor data(i) 11 CRC16Lo = CRC16Hi Xor GetCRCLo(iIndex) '低位处理 12 CRC16Hi = GetCRCHi(iIndex) '高位处理 13 Next i 14 Dim ReturnData(1) As Byte 15 ReturnData(0) = CRC16Hi 'CRC高位 16 ReturnData(1) = CRC16Lo 'CRC低位 17 CRC16 = ReturnData 18 End Function 19 20 21 22 'CRC低位字节值表 23 Function GetCRCLo(Ind As Long) As Byte 24 GetCRCLo = Choose(Ind + 1, &H0, &HC1, &H81, &H40, &H1, &HC0, &H80, _ 25 &H41, &H1, &HC0, &H80, &H41, &H0, &HC1, &H81, &H40, &H1, &HC0, &H80, &H41, _ 26 &H0, &HC1, &H81, &H40, &H0, &HC1, &H81, &H40, &H1, &HC0, &H80, &H41, &H1, _ 27 &HC0, &H80, &H41, &H0, &HC1, &H81, &H40, &H0, &HC1, &H81, &H40, &H1, &HC0, _ 28 &H80, &H41, &H0, &HC1, &H81, &H40, &H1, &HC0, &H80, &H41, &H1, &HC0, &H80, _ 29 &H41, &H0, &HC1, &H81, &H40, &H1, &HC0, &H80, &H41, &H0, &HC1, &H81, &H40, _ 30 &H0, &HC1, &H81, &H40, &H1, &HC0, &H80, &H41, &H0, &HC1, &H81, &H40, &H1, _ 31 &HC0, &H80, &H41, &H1, &HC0, &H80, &H41, &H0, &HC1, &H81, &H40, &H0, &HC1, _ 32 &H81, &H40, &H1, &HC0, &H80, &H41, &H1, &HC0, &H80, &H41, &H0, &HC1, &H81, _ 33 &H40, &H1, &HC0, &H80, &H41, &H0, &HC1, &H81, &H40, &H0, &HC1, &H81, &H40, _ 34 &H1, &HC0, &H80, &H41, &H1, &HC0, _ 35 &H80, &H41, &H0, &HC1, &H81, &H40, &H0, &HC1, &H81, &H40, &H1, &HC0, &H80, _ 36 &H41, &H0, &HC1, &H81, &H40, &H1, &HC0, &H80, &H41, &H1, &HC0, &H80, &H41, _ 37 &H0, &HC1, &H81, &H40, &H0, &HC1, &H81, &H40, &H1, &HC0, &H80, &H41, &H1, _ 38 &HC0, &H80, &H41, &H0, &HC1, &H81, &H40, &H1, &HC0, &H80, &H41, &H0, &HC1, _ 39 &H81, &H40, &H0, &HC1, &H81, &H40, &H1, &HC0, &H80, &H41, &H0, &HC1, &H81, _ 40 &H40, &H1, &HC0, &H80, &H41, &H1, &HC0, &H80, &H41, &H0, &HC1, &H81, &H40, _ 41 &H1, &HC0, &H80, &H41, &H0, &HC1, &H81, &H40, &H0, &HC1, &H81, &H40, &H1, _ 42 &HC0, &H80, &H41, &H1, &HC0, &H80, &H41, &H0, &HC1, &H81, &H40, &H0, &HC1, _ 43 &H81, &H40, &H1, &HC0, &H80, &H41, &H0, &HC1, &H81, &H40, &H1, &HC0, &H80, _ 44 &H41, &H1, &HC0, &H80, &H41, &H0, &HC1, &H81, &H40) 45 End Function 46 47 'CRC高位字节值表 48 Function GetCRCHi(Ind As Long) As Byte 49 GetCRCHi = Choose(Ind + 1, &H0, &HC0, &HC1, &H1, &HC3, &H3, &H2, &HC2, _ 50 &HC6, &H6, &H7, &HC7, &H5, &HC5, &HC4, &H4, &HCC, &HC, &HD, &HCD, &HF, _ 51 &HCF, &HCE, &HE, &HA, &HCA, &HCB, &HB, &HC9, &H9, &H8, &HC8, &HD8, &H18, _ 52 &H19, &HD9, &H1B, &HDB, &HDA, &H1A, &H1E, &HDE, &HDF, &H1F, &HDD, &H1D, _ 53 &H1C, &HDC, &H14, &HD4, &HD5, &H15, &HD7, &H17, &H16, &HD6, &HD2, &H12, _ 54 &H13, &HD3, &H11, &HD1, &HD0, &H10, &HF0, &H30, &H31, &HF1, &H33, &HF3, _ 55 &HF2, &H32, &H36, &HF6, &HF7, &H37, &HF5, &H35, &H34, &HF4, &H3C, &HFC, _ 56 &HFD, &H3D, &HFF, &H3F, &H3E, &HFE, &HFA, &H3A, &H3B, &HFB, &H39, &HF9, _ 57 &HF8, &H38, &H28, &HE8, &HE9, &H29, &HEB, &H2B, &H2A, &HEA, &HEE, &H2E, _ 58 &H2F, &HEF, &H2D, &HED, &HEC, &H2C, &HE4, &H24, &H25, &HE5, &H27, &HE7, _ 59 &HE6, &H26, &H22, &HE2, &HE3, &H23, &HE1, &H21, &H20, &HE0, &HA0, &H60, _ 60 &H61, &HA1, &H63, &HA3, &HA2, &H62, &H66, &HA6, &HA7, &H67, &HA5, &H65, _ 61 &H64, &HA4, &H6C, &HAC, &HAD, &H6D, &HAF, &H6F, &H6E, &HAE, &HAA, &H6A, _ 62 &H6B, &HAB, &H69, &HA9, &HA8, &H68, &H78, &HB8, &HB9, &H79, &HBB, &H7B, _ 63 &H7A, &HBA, &HBE, &H7E, &H7F, &HBF, &H7D, &HBD, &HBC, &H7C, &HB4, &H74, _ 64 &H75, &HB5, &H77, &HB7, &HB6, &H76, &H72, &HB2, &HB3, &H73, &HB1, &H71, _ 65 &H70, &HB0, &H50, &H90, &H91, &H51, &H93, &H53, &H52, &H92, &H96, &H56, _ 66 &H57, &H97, &H55, &H95, &H94, &H54, &H9C, &H5C, &H5D, &H9D, &H5F, &H9F, _ 67 &H9E, &H5E, &H5A, &H9A, &H9B, &H5B, &H99, &H59, &H58, &H98, &H88, &H48, _ 68 &H49, &H89, &H4B, &H8B, &H8A, &H4A, &H4E, &H8E, &H8F, &H4F, &H8D, &H4D, _ 69 &H4C, &H8C, &H44, &H84, &H85, &H45, &H87, &H47, &H46, &H86, &H82, &H42, _ 70 &H43, &H83, &H41, &H81, &H80, &H40) 71 End Function 72 73 Private Sub Form_Load() 74 Dim d() As Byte 75 d = StrConv("crc16test", vbFromUnicode) ' 字符串转字节数组 76 Dim s() As Byte 77 s = CRC16(d) 78 ' s(0) 高字节 s(1) 低字节 79 Me.AutoRedraw = True 80 Me.Print Hex(s(0)) + Hex(s(1)) ' 显示出2481 81 End Sub
JavaScript
1 var CRC = {}; 2 3 CRC._auchCRCHi = [ 4 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 5 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 6 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 7 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 8 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 9 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 10 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 11 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 12 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 13 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 14 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 15 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 16 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 17 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 18 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 19 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 20 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 21 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 22 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 23 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 24 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 25 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 26 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 27 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 28 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 29 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 30 ]; 31 CRC._auchCRCLo = [ 32 0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 33 0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 34 0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 35 0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 36 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC, 0x14, 0xD4, 37 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3, 38 0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 39 0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 40 0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 41 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29, 42 0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED, 43 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26, 44 0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 45 0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 46 0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 47 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68, 48 0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E, 49 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5, 50 0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 51 0x70, 0xB0, 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 52 0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 53 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B, 54 0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B, 55 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C, 56 0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 57 0x43, 0x83, 0x41, 0x81, 0x80, 0x40 58 ]; 59 60 CRC.CRC16 = function (buffer) { 61 var hi = 0xff; 62 var lo = 0xff; 63 for (var i = 0; i < buffer.length; i++) { 64 var idx = hi ^ buffer[i]; 65 hi = (lo ^ CRC._auchCRCHi[idx]); 66 lo = CRC._auchCRCLo[idx]; 67 } 68 return CRC.padLeft((hi << 8 | lo).toString(16).toUpperCase(), 4, '0'); 69 }; 70 71 CRC.isArray = function (arr) { 72 return Object.prototype.toString.call(arr) === '[object Array]'; 73 }; 74 75 CRC.ToCRC16 = function (str) { 76 return CRC.CRC16(CRC.isArray(str) ? str : CRC.strToByte(str)); 77 }; 78 79 CRC.ToModbusCRC16 = function (str) { 80 return CRC.CRC16(CRC.isArray(str) ? str : CRC.strToHex(str)); 81 }; 82 83 CRC.strToByte = function (str) { 84 var tmp = str.split(''), arr = []; 85 for (var i = 0, c = tmp.length; i < c; i++) { 86 var j = encodeURI(tmp[i]); 87 if (j.length == 1) { 88 arr.push(j.charCodeAt()); 89 } else { 90 var b = j.split('%'); 91 for (var m = 1; m < b.length; m++) { 92 arr.push(parseInt('0x' + b[m])); 93 } 94 } 95 } 96 return arr; 97 }; 98 99 CRC.convertChinese = function (str) { 100 var tmp = str.split(''), arr = []; 101 for (var i = 0, c = tmp.length; i < c; i++) { 102 var s = tmp[i].charCodeAt(); 103 if (s <= 0 || s >= 127) { 104 arr.push(s.toString(16)); 105 } 106 else { 107 arr.push(tmp[i]); 108 } 109 } 110 return arr; 111 }; 112 113 CRC.filterChinese = function (str) { 114 var tmp = str.split(''), arr = []; 115 for (var i = 0, c = tmp.length; i < c; i++) { 116 var s = tmp[i].charCodeAt(); 117 if (s > 0 && s < 127) { 118 arr.push(tmp[i]); 119 } 120 } 121 return arr; 122 }; 123 124 CRC.strToHex = function (hex, isFilterChinese) { 125 hex = isFilterChinese ? CRC.filterChinese(hex).join('') : CRC.convertChinese(hex).join(''); 126 127 //清除所有空格 128 hex = hex.replace(/s/g, ""); 129 //若字符个数为奇数，补一个空格 130 hex += hex.length % 2 != 0 ? " " : ""; 131 132 var c = hex.length / 2, arr = []; 133 for (var i = 0; i < c; i++) { 134 arr.push(parseInt(hex.substr(i * 2, 2), 16)); 135 } 136 return arr; 137 }; 138 139 CRC.padLeft = function (s, w, pc) { 140 if (pc == undefined) { 141 pc = '0'; 142 } 143 for (var i = 0, c = w - s.length; i < c; i++) { 144 s = pc + s; 145 } 146 return s; 147 };