ASCII和各种进制之间的转换

#define TOLOWER(x) ((x) | 0x20)
#define isxdigit(c) (('0' <= (c) && (c) <= '9') || ('a' <= (c) && (c) <= 'f') || ('A' <= (c) && (c) <= 'F'))
#define isdigit(c) ('0' <= (c) && (c) <= '9')

//bin2str(signret,out,strlen(signret),16); ASCII转换为16进制
//last char of in must be 0x00
void bin2str(unsigned char* in,char* out,int size,int base)
{
unsigned char* pt1 = in;
char* pt2 = out;
do
{
pt2 += sprintf(pt2,"%02X",*pt1++);
size--;
}while(*pt1 && size);
}
//16进制转换为ASCII
void str2bin(char* in,unsigned char* out,int size,int base)
{
unsigned char* pt1 = (unsigned char*)in;
unsigned char* pt2 = out;
while (isxdigit(*pt1) && size--)
{
*pt2++ = base * ( isdigit(*pt1) ? *pt1++-'0' : TOLOWER(*pt1++)-'a'+10) + ( isdigit(*pt1) ? *pt1++-'0' : TOLOWER(*pt1++)-'a'+10);

}
}