c++、java CRC16算法

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C++

int get_crc16 (unsigned char *bufData, unsigned int buflen, unsigned char *pcrc){int ret = 0;unsigned short CRC = 0xffff;unsigned short POLYNOMIAL = 0xa001;int i, j;if(bufData == NULL || pcrc == NULL){return -1;}if (buflen == 0){return ret;}for (i = 0; i < buflen; i++){CRC ^= bufData[i];for (j = 0; j < 8; j++){if ((CRC & 0x0001) != 0){CRC >>= 1;CRC ^= POLYNOMIAL;}else{CRC >>= 1;}}}printf ("CRC=%X\n", CRC);pcrc[0] = (unsigned char)(CRC & 0x00ff);pcrc[1] = (unsigned char)(CRC >> 8);return ret;}int main(int argc, char *argv[]){unsigned char cc[]={0x30,0x30,0x34,0x36,0x46,0x44,0x36,0x30,0x30,0x30,0x01,0x72,0x65,0x66,0x65,0x72,0x69,0x6E,0x66,0x6F,0x2E,0x63,0x73,0x76,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0xf4,0x01};//unsigned char cc[] = {0x00, 0xff};unsigned char crcs[3] = {0};int ret = get_crc16 (cc, 46, crcs);printf("ret = %d\n", ret);return 0;}

public static int get_crc16 (byte[] bufData, int buflen, byte[] pcrc){int ret = 0;int CRC = 0x0000ffff;int POLYNOMIAL = 0x0000a001;int i, j;if (buflen == 0){return ret;}for (i = 0; i < buflen; i++){CRC ^= ((int)bufData[i] & 0x000000ff);for (j = 0; j < 8; j++){if ((CRC & 0x00000001) != 0){CRC >>= 1;CRC ^= POLYNOMIAL;}else{CRC >>= 1;}}//System.out.println(Integer.toHexString(CRC));}System.out.println(Integer.toHexString(CRC));pcrc[0] = (byte)(CRC & 0x00ff);pcrc[1] = (byte)(CRC >> 8);return ret;}/** * @param args */public static void main(String[] args) {byte[] aa = {0x30,0x30,0x34,0x36,0x46,0x44,0x36,0x30,0x30,0x30,0x01,0x72,0x65,0x66,0x65,0x72,0x69,0x6E,0x66,0x6F,0x2E,0x63,0x73,0x76,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,(byte)0xf4,0x01};byte[] bb = new byte[3];Crc16.get_crc16(aa, aa.length, bb);System.out.println(Integer.toHexString((int)bb[0] & 0x000000ff));System.out.println(Integer.toHexString((int)bb[1] & 0x000000ff));}

经过验证c++和java计算的结果是一样的。可以放心使用。

验证工具：SinloCRC16效验小工具（度娘一下）

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