BCD与ASCII码互转-C语言实现

来源：互联网发布：linux touch 编辑：程序博客网时间：2024/05/16 23:51

最近由于项目需要，需要将BCD编码转换为对应的字符串，下面为C语言实现，经测试好用！

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/*BCD 与 ASCII码转换*//*******************************************************************函数名:  asc2bcd 功能描述:将ascii码转换为bcd码参数:             bcd:转换后的BCD码         asc:需转换的ASCII码串         len:需转换的ascii码串长度返回值:  uint32                               0：成功                              其他:失败********************************************************************/uint32 asc2bcd(uint8* bcd, const uint8* asc, uint32 len);/*******************************************************************函数名: bcd2asc 功能描述:将bcd码转换为ascii码串参数:             asc:转换的ASCII码串         bcd:需转换的BCD码         len:需转换的BCD码长度返回值:  uint32                               0：成功                              其他:失败********************************************************************/uint32 bcd2asc(uint8* asc, const uint8* bcd, uint32 len);

#include <assert.h>#include "utils.h"//基于查表实现BCD与Ascii之间的转换static uint8 bcd2ascii[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};static uint8 ascii2bcd1[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};static uint8 ascii2bcd2[6]  = {0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F};

uint32 ASC2BCD(uint8 *bcd, const uint8 *asc, uint32 len){    uint8 c = 0;    uint8 index = 0;    uint8 i = 0;          len >>= 1;        for(; i < len; i++) {        //first BCD        if(*asc >= 'A' && *asc <= 'F') {            index = *asc - 'A';             c  = ascii2bcd2[index] << 4;        } else if(*asc >= '0' && *asc <= '9') {            index = *asc - '0';            c  = ascii2bcd1[index] << 4;        }        asc++;        //second BCD        if(*asc >= 'A' && *asc <= 'F') {            index = *asc - 'A';             c  |= ascii2bcd2[index];        } else if(*asc >= '0' && *asc <= '9') {            index = *asc - '0';            c  |= ascii2bcd1[index];        }        asc++;        *bcd++ = c;    }       return 0;}

uint32BCD2ASC (uint8 *asc, const uint8 *bcd, uint32 len){    uint8 c = 0;    uint8 i;    for(i = 0; i < len; i++) {        //first BCD        c = *bcd >> 4;        *asc++ = bcd2ascii[c];        //second        c = *bcd & 0x0f;        *asc++ = bcd2ascii[c];        bcd++;    }    return 0;}

int main(void)//测试程序{    const unsigned char ascii[12] = {'1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C'};    unsigned char bcd[6];    ASC2BCD(bcd, ascii, 12, 0);         int i = 0;    printf("ascii = %s\n", ascii);    for(; i < 6; i++) {        printf("bcd = 0x%.2x\n", bcd[i]);    }       /*         unsigned char ascii[13] = {0};       const unsigned char bcd[6] = {0x01, 0x23, 0x45, 0xCD, 0xEF, 0xAB};       BCD2ASC(ascii, bcd, 6, 0);       printf("ascii = %s\n", ascii);       */    return 0;}

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