ios – 如何计算NSData的CRC-8-DallasMaxim？

概述我需要准确计算CRC-8-Dallas / Maxim.有人可以提供算法吗？ 任何帮助表示赞赏！ CRC-8-Dallas / Maxim Variant 1(C风格)： unsigned char dallas_crc8(const unsigned char * data, const unsigned int size){ unsigned char crc = 0; fo 我需要准确计算CRC-8-Dallas / Maxim.有人可以提供算法吗？

任何帮助表示赞赏！

解决方法 CRC-8-Dallas / Maxim Variant 1(C风格)：

unsigned char dallas_crc8(const unsigned char * data,const unsigned int size){    unsigned char crc = 0;    for ( unsigned int i = 0; i < size; ++i )    {        unsigned char inbyte = data[i];        for ( unsigned char j = 0; j < 8; ++j )        {            unsigned char mix = (crc ^ inbyte) & 0x01;            crc >>= 1;            if ( mix ) crc ^= 0x8C;            inbyte >>= 1;        }    }    return crc;}

CRC-8-Dallas / Maxim Variant 2(C风格)：

unsigned char crc_bits(unsigned char data){    unsigned char crc = 0;    if(data & 1)     crc ^= 0x5e;    if(data & 2)     crc ^= 0xbc;    if(data & 4)     crc ^= 0x61;    if(data & 8)     crc ^= 0xc2;    if(data & 0x10)  crc ^= 0x9d;    if(data & 0x20)  crc ^= 0x23;    if(data & 0x40)  crc ^= 0x46;    if(data & 0x80)  crc ^= 0x8c;    return crc;}unsigned char dallas_crc8(const unsigned char * data,const unsigned int size){    unsigned char crc = 0;    for ( unsigned int i = 0; i < size; ++i )    {         crc = crc_bits(data[i] ^ crc);    }    return crc;}

CRC-8-Dallas / Maxim Variant 3(C风格)：

unsigned char crc_array[256] ={    0x00,0x5e,0xbc,0xe2,0x61,0x3f,0xdd,0x83,0xc2,0x9c,0x7e,0x20,0xa3,0xfd,0x1f,0x41,0x9d,0xc3,0x21,0x7f,0xfc,0xa2,0x40,0x1e,0x5f,0x01,0xe3,0xbd,0x3e,0x60,0x82,0xdc,0x23,0x7d,0x9f,0xc1,0x42,0x1c,0xfe,0xa0,0xe1,0xbf,0x5d,0x03,0x80,0xde,0x3c,0x62,0xbe,0xe0,0x02,0x5c,0xdf,0x81,0x63,0x3d,0x7c,0x22,0xc0,0x9e,0x1d,0x43,0xa1,0xff,0x46,0x18,0xfa,0xa4,0x27,0x79,0x9b,0xc5,0x84,0xda,0x38,0x66,0xe5,0xbb,0x59,0x07,0xdb,0x85,0x67,0x39,0xba,0xe4,0x06,0x58,0x19,0x47,0xa5,0xfb,0x78,0x26,0xc4,0x9a,0x65,0x3b,0xd9,0x87,0x04,0x5a,0xb8,0xe6,0xa7,0xf9,0x1b,0x45,0xc6,0x98,0x7a,0x24,0xf8,0xa6,0x44,0x1a,0x99,0xc7,0x25,0x7b,0x3a,0x64,0x86,0xd8,0x5b,0x05,0xe7,0xb9,0x8c,0xd2,0x30,0x6e,0xed,0xb3,0x51,0x0f,0x4e,0x10,0xf2,0xac,0x2f,0x71,0x93,0xcd,0x11,0x4f,0xad,0xf3,0x70,0x2e,0xcc,0x92,0xd3,0x8d,0x6f,0x31,0xb2,0xec,0x0e,0x50,0xaf,0xf1,0x13,0x4d,0xce,0x90,0x72,0x2c,0x6d,0x33,0xd1,0x8f,0x0c,0x52,0xb0,0xee,0x32,0x6c,0x8e,0xd0,0x53,0x0d,0xef,0xb1,0xf0,0xae,0x4c,0x12,0x91,0xcf,0x2d,0x73,0xca,0x94,0x76,0x28,0xab,0xf5,0x17,0x49,0x08,0x56,0xb4,0xea,0x69,0x37,0xd5,0x8b,0x57,0x09,0xeb,0xb5,0x36,0x68,0x8a,0xd4,0x95,0xcb,0x29,0x77,0xf4,0xaa,0x48,0x16,0xe9,0xb7,0x55,0x0b,0x88,0xd6,0x34,0x6a,0x2b,0x75,0x97,0xc9,0x4a,0x14,0xf6,0xa8,0x74,0x2a,0xc8,0x96,0x15,0x4b,0xa9,0xf7,0xb6,0xe8,0x0a,0x54,0xd7,0x89,0x6b,0x35,};unsigned char dallas_crc8(const unsigned char * data,const unsigned int size){    unsigned char crc = 0;    for ( unsigned int i = 0; i < size; ++i )    {         crc = crc_array[data[i] ^ crc];    }    return crc;}

CRC-8-Dallas / Maxim Variant 4(带增强的C风格)：

#include "boost/crc.hpp"uint8_t dallas_crc8(const uint8_t * data,const uint32_t size){    boost::crc_optimal <8,true,true> crc;    crc.process_bytes(data,size);    return crc.checksum();}

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