blob: e9f46f8a2ca9e035c9bf238f16d7e96aa0de4ba5 [file] [log] [blame]
/*
* Copyright (c) 2019 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stddef.h>
#include <zephyr/types.h>
#include <errno.h>
#include <sys/util.h>
int char2hex(char c, u8_t *x)
{
if (c >= '0' && c <= '9') {
*x = c - '0';
} else if (c >= 'a' && c <= 'f') {
*x = c - 'a' + 10;
} else if (c >= 'A' && c <= 'F') {
*x = c - 'A' + 10;
} else {
return -EINVAL;
}
return 0;
}
int hex2char(u8_t x, char *c)
{
if (x <= 9) {
*c = x + '0';
} else if (x >= 10 && x <= 15) {
*c = x - 10 + 'a';
} else {
return -EINVAL;
}
return 0;
}
size_t bin2hex(const u8_t *buf, size_t buflen, char *hex, size_t hexlen)
{
if ((hexlen + 1) < buflen * 2) {
return 0;
}
for (size_t i = 0; i < buflen; i++) {
if (hex2char(buf[i] >> 4, &hex[2 * i]) < 0) {
return 0;
}
if (hex2char(buf[i] & 0xf, &hex[2 * i + 1]) < 0) {
return 0;
}
}
hex[2 * buflen] = '\0';
return 2 * buflen;
}
size_t hex2bin(const char *hex, size_t hexlen, u8_t *buf, size_t buflen)
{
u8_t dec;
if (buflen < hexlen / 2 + hexlen % 2) {
return 0;
}
/* if hexlen is uneven, insert leading zero nibble */
if (hexlen % 2) {
if (char2hex(hex[0], &dec) < 0) {
return 0;
}
buf[0] = dec;
hex++;
buf++;
}
/* regular hex conversion */
for (size_t i = 0; i < hexlen / 2; i++) {
if (char2hex(hex[2 * i], &dec) < 0) {
return 0;
}
buf[i] = dec << 4;
if (char2hex(hex[2 * i + 1], &dec) < 0) {
return 0;
}
buf[i] += dec;
}
return hexlen / 2 + hexlen % 2;
}