CRC16-CCITT 的算法
来源:互联网 发布:apache 网络驱动器 编辑:程序博客网 时间:2024/06/04 18:45
http://djb69.blog.163.com/blog/static/6776323420100158391490/
无限风光在险峰,垫几块砖瓦希望你看得更远!
#include <iostream>#define CRC_CCITT 0x1021 //CRC-CCITT多项式using namespace std;unsigned int crc_ta_8[256]={ /* CRC 字节余式表 */ 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0};
unsigned int crc_ta_4[16]={ /* CRC 半字节余式表 */ 0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7, 0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef,};
/**CRC算法一,适用于程序空间苛刻但CRC计算速度要求不高的微控制系统算法概要说明:计算本位后的CRC 码等于上一位CRC 码乘以2 后除以多项式,所得的余数再加上本位值除以多项式所得的余数*//*函数名称:crc_cal_by_bit;按位计算CRC 函数参数:unsigned char* ptr;指向发送缓冲区的首字节 unsigned char len;要发送的总字节数 函数返回值:unsigned int 多项式采用CRC-CCITT 0x1021*/unsigned int crc_cal_by_bit(unsigned char* ptr, unsigned char len){ unsigned int crc = 0; while(len-- != 0) { for(unsigned char i = 0x80; i != 0; i /= 2) { crc *= 2; if((crc&0x10000) !=0) //上一位CRC乘 2后,若首位是1,则除以 0x11021 crc ^= 0x11021; if((*ptr&i) != 0) //如果本位是1,那么CRC = 上一位的CRC + 本位/CRC_CCITT crc ^= CRC_CCITT; } ptr++; } return crc;}
/**CRC算法二,适用于程序空间较大且CRC计算速度要求较高的计算机或微控制系统算法概要说明:计算本字节后的CRC 码等于上一字节余式CRC码的低8位左移8位后,再加上上一字节CRC 右移8 位(也既取高8 位)和本字节之和后所求得的CRC码*//*函数名称:crc_cal_by_byte;按字节计算CRC 函数参数:unsigned char* ptr:指向发送缓冲区的首字节 unsigned char len:要发送的总字节数 函数返回值:unsigned int 多项式采用CRC-CCITT 0x1021*/unsigned int crc_cal_by_byte(unsigned char* ptr, unsigned char len){ unsigned short crc = 0; while(len-- != 0) { unsigned int high = (unsigned int)(crc/256); //取CRC高8位 crc <<= 8; crc ^= crc_ta_8[high^*ptr]; ptr++; } return crc;}
/**CRC算法三,适用于程序空间不太大且CRC计算速度又不可以太慢的微控制系统*//*函数名称:crc_cal_by_halfbyte:按半字节计算CRC 函数参数:unsigned char* ptr:指向发送缓冲区的首字节 unsigned char len:要发送的总字节数 函数返回值:unsigned int 多项式采用CRC-CCITT 0x1021*/unsigned int crc_cal_by_halfbyte(unsigned char* ptr, unsigned char len){ unsigned short crc = 0; while(len-- != 0) { unsigned char high = (unsigned char)(crc/4096); //暂存CRC的高4位 crc <<= 4; crc ^= crc_ta_4[high^(*ptr/16)]; high = (unsigned char)(crc/4096); crc <<= 4; crc ^= crc_ta_4[high^(*ptr&0x0f)]; ptr++; } return crc;}
//unsigned short 最大是65535int main(){ unsigned char ptr[] = {0xa0, 0xa0, 0xa0}; cout << crc_cal_by_bit(ptr, 3) << '\n'; cout << crc_cal_by_halfbyte(ptr, 3) << '\n'; cout << crc_cal_by_byte(ptr, 3) << '\n';}
0 0
- CRC16-CCITT 的算法
- CRC16-CCITT 的算法
- CCITT-CRC16
- ccitt crc16
- vc++ CRC16-CCITT循环码验证算法
- crc16 ccitt 单片机与java匹配算法
- CRC16-CCITT校验算法实现(C#版)
- Java实现CRC16 CCITT
- CCITT标准CRC16(1021) Java代码
- CCITT标准CRC16(1021) Java代码
- java实现的CRC16算法
- CRC16算法的Java实现
- CRC-CCITT算法
- CRC16算法
- 一种设备的CRC16校验算法
- CRC16校验算法的Java实现
- CCITT对媒体的分类
- CRC16算法函数
- Mysql 涉及事务的存储过程
- Asp.Net分页存储过程
- SUSE Linux 64位环境下编译hadoop2.2.0源码
- inputAccessoryView,inputView
- HDU-OJ-2752 WiFi
- CRC16-CCITT 的算法
- WebViewClient()
- Java中 CopyOnWriteArrayList 的使用与ConcurrentModificationException错误的避免
- 【Oracle】/etc/resolv.conf配置导致的sqlplus登录过慢
- shell中的求幂
- Java中对象初始化顺序
- (libgdx学习)ScrollPane(使用ScrollPane来创建一个横向滚动条)
- 总结一些 android 平常用到的自定义控件
- 寄存器绝对地址操作