[单片机框架] [str_hex] 字符串和16进制互转 string to hex

/********************************************************************************
* @file    str_hex.c
* @author  jianqiang.xue
* @Version V1.0.0
* @Date    2021-04-27
* @brief   NULL
********************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include <stdio.h>
#include <stdint.h>
#include <string.h>

/* Public function prototypes -----------------------------------------------*/
/**
  * @brief  字符串转16进制值
  * @param  str: 16进制字符串(低位在前) 比如：0x1234，则输入"3412", 然后输出 0x1234
  * @param  out: 16进制数字存放的数组
  * @retval 输出数组长度
  */
uint8_t str_to_hex(char *str, uint8_t *out)
{
    char *p = str;
    char high = 0, low = 0;
    uint8_t tmplen = strlen(p), cnt = 0;

    tmplen = strlen(p);

    while (cnt < (tmplen / 2))
    {
        high = ((*p > '9') && ((*p <= 'F') || (*p <= 'f'))) ? *p - 48 - 7 : *p - 48;
        low = (*(++p) > '9' && ((*p <= 'F') || (*p <= 'f'))) ? *(p)-48 - 7 : *(p)-48;
        out[cnt] = ((high & 0x0f) << 4 | (low & 0x0f));
        p++;
        cnt++;
    }

    if (tmplen % 2 != 0)
    {
        out[cnt] = ((*p > '9') && ((*p <= 'F') || (*p <= 'f'))) ? *p - 48 - 7 : *p - 48;
    }

    return (tmplen / 2 + tmplen % 2);
}

/**
 * @brief  字节值转字符串 0x1234 -> "1234"
 * @note   NULL
 * @param  *dest: 存放转换后的字符串
 * @param  *source: 需要转换的缓存区
 * @param  sourceLen: 需要转换的字节长度
 * @retval None
 */
void byte_to_string(uint8_t *dest, uint8_t *source, int sourceLen)
{
    uint8_t i = 0;
    uint8_t highByte = 0, lowByte = 0;
    uint8_t temp[6] = {0};

    for (i = 0; i < sourceLen; i++)
    {
        highByte = source[i] >> 4;
        lowByte = source[i] & 0x0f;
        highByte += 0x30;
        if (highByte > 0x39)
            temp[i * 2] = highByte + 0x07;
        else
            temp[i * 2] = highByte;

        lowByte += 0x30;
        if (lowByte > 0x39)
            temp[i * 2 + 1] = lowByte + 0x07;
        else
            temp[i * 2 + 1] = lowByte;
    }

    memcpy(dest, temp, 2 * sourceLen);
}

/********************************************************************************
* @file    str_hex.h
* @author  jianqiang.xue
* @Version V1.0.0
* @Date    2021-04-27
* @brief   NULL
********************************************************************************/

#ifndef __STR_HEX_H
#define __STR_HEX_H

#include <stdint.h>

uint8_t str_to_hex(char *str, uint8_t *out);
void byte_to_string(uint8_t *dest, uint8_t *source, int sourceLen);

#endif