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\n",sizeof("crc16test")-1); // length 9
31 printf("%x\n",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 };
