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/* copyright (c) 2022 - 2023 grunfink et al. / MIT license */
#ifndef _XS_HEX_H
#define _XS_HEX_H
xs_str *xs_hex_enc(const xs_val *data, int size);
xs_val *xs_hex_dec(const xs_str *hex, int *size);
int xs_is_hex(const char *str);
#ifdef XS_IMPLEMENTATION
/** hex **/
static char rev_hex_digits[] = "fedcba9876543210FEDCBA";
xs_str *xs_hex_enc(const xs_val *data, int size)
/* returns an hexdump of data */
{
xs_str *s;
char *p;
int n;
p = s = xs_realloc(NULL, _xs_blk_size(size * 2 + 1));
for (n = 0; n < size; n++) {
*p++ = rev_hex_digits[0xf - (*data >> 4 & 0xf)];
*p++ = rev_hex_digits[0xf - (*data & 0xf)];
data++;
}
*p = '\0';
return s;
}
xs_val *xs_hex_dec(const xs_str *hex, int *size)
/* decodes an hexdump into data */
{
int sz = strlen(hex);
xs_val *s = NULL;
char *p;
int n;
if (sz % 2)
return NULL;
p = s = xs_realloc(NULL, _xs_blk_size(sz / 2 + 1));
for (n = 0; n < sz; n += 2) {
char *d1 = strchr(rev_hex_digits, *hex++);
char *d2 = strchr(rev_hex_digits, *hex++);
if (!d1 || !d2) {
/* decoding error */
return xs_free(s);
}
*p++ = (0xf - ((d1 - rev_hex_digits) & 0xf)) << 4 |
(0xf - ((d2 - rev_hex_digits) & 0xf));
}
*p = '\0';
*size = sz / 2;
return s;
}
int xs_is_hex(const char *str)
/* returns 1 if str is an hex string */
{
while (*str) {
if (strchr(rev_hex_digits, *str++) == NULL)
return 0;
}
return 1;
}
#endif /* XS_IMPLEMENTATION */
#endif /* _XS_HEX_H */
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