1 /* CC0 license (public domain) - see LICENSE file for details */
2 #include <ccan/str/hex/hex.h>
7 static bool char_to_hex(unsigned char *val, char c)
9 if (c >= '0' && c <= '9') {
13 if (c >= 'a' && c <= 'f') {
17 if (c >= 'A' && c <= 'F') {
24 bool hex_decode(const char *str, size_t slen, void *buf, size_t bufsize)
27 unsigned char *p = buf;
30 if (!char_to_hex(&v1, str[0]) || !char_to_hex(&v2, str[1]))
34 *(p++) = (v1 << 4) | v2;
39 return slen == 0 && bufsize == 0;
42 static char hexchar(unsigned int val)
47 return 'a' + val - 10;
51 bool hex_encode(const void *buf, size_t bufsize, char *dest, size_t destsize)
55 if (destsize < hex_str_size(bufsize))
58 for (i = 0; i < bufsize; i++) {
59 unsigned int c = ((const unsigned char *)buf)[i];
60 *(dest++) = hexchar(c >> 4);
61 *(dest++) = hexchar(c & 0xF);