Linux c 源码（nMAsciiHexToBinary：将16进制字符串格式转换为ASCII码形式）

最新推荐文章于 2022-09-20 15:59:15 发布

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最新推荐文章于 2022-09-20 15:59:15 发布 · 3.8k 阅读

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#ascii #hex #bin #转换

该博客介绍了C语言中名为nMAsciiHexToBinary的函数，用于将16进制字符串转换成ASCII码形式。函数首先检查输入字符串长度是否为偶数，然后遍历字符串，根据字符的ASCII值将其转换为16进制数值，并组合成ASCII字符。如果遇到非法字符，函数返回错误码-1。

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short nMAsciiHexToBinary(
unsigned char* vspSourceStr,
short          vnSourceStrL,
unsigned char* vspDestStr) {


if(vnSourceStrL % 2)
return -1;


for(; vnSourceStrL > 0; vnSourceStrL -= 2) {
if(*vspSourceStr >= '0' &&
*vspSourceStr <= '9')
*vspDestStr = ((*vspSourceStr++) - '0') * 16;
else if(*vspSourceStr >= 'a' && 
*vspSourceStr <= 'f')
*vspDestStr = ((*vspSourceStr++) - 'a' + 10) * 16;
else if(*vspSourceStr >= 'A' && 
*vspSourceStr <= 'F')
*vspDestStr = ((*vspSourceStr++) - 'A' + 10) * 16;
else
return -1;
if(*vspSourceStr >= '0' &&
*vspSourceStr <= '9')
(*vspDestStr++) += ((*vspSourceStr++) - '0');
else if(*vspSourceStr >= 'a' && 
*vspSourceStr <= 'f')
(*vspDestStr++) += ((*vspSourceStr++) - 'a' + 10);
else if(*vspSourceStr >= 'A' && 
*vspSourceStr <= 'F')
(*vspDestStr++) += ((*vspSourceStr++) - 'A' + 10);
else
return -1;