#include "hexString.h"
static uint8_t
nibbleFromChar(char c)
{
if(c >= '0' && c <= '9') return c - '0';
if(c >= 'a' && c <= 'f') return c - 'a' + 10;
if(c >= 'A' && c <= 'F') return c - 'A' + 10;
return 255;
}
uint8_t
*hexStringToBytes(char *inhex)
{
uint8_t *retval;
uint8_t *p;
int len, i;
len = strlen(inhex) / 2;
retval = malloc(len+1);
for(i=0, p = (uint8_t *) inhex; i<len; i++) {
retval[i] = (nibbleFromChar(*p) << 4) | nibbleFromChar(*(p+1));
p += 2;
}
retval[len] = 0;
return retval;
}
static char byteMap[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
static int byteMapLen = sizeof(byteMap);
static char
nibbleToChar(uint8_t nibble)
{
if(nibble < byteMapLen) return byteMap[nibble];
return '*';
}
char
*bytesToHexString(uint8_t *bytes, size_t buflen)
{
char *retval;
int i;
retval = malloc(buflen*2 + 1);
for(i=0; i<buflen; i++) {
retval[i*2] = nibbleToChar(bytes[i] >> 4);
retval[i*2+1] = nibbleToChar(bytes[i] & 0x0f);
}
retval[i] = '\0';
return retval;
}