blob: f65125e3c6a02d5371f62340b774b0d2673d8951 [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 <zephyr/sys/util.h>
int char2hex(char c, uint8_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(uint8_t x, char *c)
{
if (x <= 9) {
*c = x + (char)'0';
} else if (x <= 15) {
*c = x - 10 + (char)'a';
} else {
return -EINVAL;
}
return 0;
}
size_t bin2hex(const uint8_t *buf, size_t buflen, char *hex, size_t hexlen)
{
if (hexlen < (buflen * 2U + 1U)) {
return 0;
}
for (size_t i = 0; i < buflen; i++) {
if (hex2char(buf[i] >> 4, &hex[2U * i]) < 0) {
return 0;
}
if (hex2char(buf[i] & 0xf, &hex[2U * i + 1U]) < 0) {
return 0;
}
}
hex[2U * buflen] = '\0';
return 2U * buflen;
}
size_t hex2bin(const char *hex, size_t hexlen, uint8_t *buf, size_t buflen)
{
uint8_t dec;
if (buflen < hexlen / 2U + hexlen % 2U) {
return 0;
}
/* if hexlen is uneven, insert leading zero nibble */
if ((hexlen % 2U) != 0) {
if (char2hex(hex[0], &dec) < 0) {
return 0;
}
buf[0] = dec;
hex++;
buf++;
}
/* regular hex conversion */
for (size_t i = 0; i < hexlen / 2U; i++) {
if (char2hex(hex[2U * i], &dec) < 0) {
return 0;
}
buf[i] = dec << 4;
if (char2hex(hex[2U * i + 1U], &dec) < 0) {
return 0;
}
buf[i] += dec;
}
return hexlen / 2U + hexlen % 2U;
}