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// From https://nachtimwald.com/2017/09/24/hex-encode-and-decode-in-c/
#include <stdlib.h>
#include <string.h>
#include "binhex.h"
char *bin2hex(const unsigned char *bin, size_t len)
{
char *out;
size_t i;
if (bin == NULL || len == 0)
return NULL;
out = malloc(len*2+1);
for (i=0; i<len; i++) {
out[i*2] = "0123456789ABCDEF"[bin[i] >> 4];
out[i*2+1] = "0123456789ABCDEF"[bin[i] & 0x0F];
}
out[len*2] = '\0';
return out;
}
int hexchr2bin(const char hex, char *out)
{
if (out == NULL)
return 0;
if (hex >= '0' && hex <= '9') {
*out = hex - '0';
} else if (hex >= 'A' && hex <= 'F') {
*out = hex - 'A' + 10;
} else if (hex >= 'a' && hex <= 'f') {
*out = hex - 'a' + 10;
} else {
return 0;
}
return 1;
}
size_t hexs2bin(const char *hex, unsigned char **out)
{
size_t len;
char b1;
char b2;
size_t i;
if (hex == NULL || *hex == '\0' || out == NULL)
return 0;
len = strlen(hex);
if (len % 2 != 0)
return 0;
len /= 2;
*out = malloc(len);
memset(*out, 'A', len);
for (i=0; i<len; i++) {
if (!hexchr2bin(hex[i*2], &b1) || !hexchr2bin(hex[i*2+1], &b2)) {
return 0;
}
(*out)[i] = (b1 << 4) | b2;
}
return len;
}
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