92 lines
1.5 KiB
C
92 lines
1.5 KiB
C
/*
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* Copyright (c) 2019 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stddef.h>
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#include <zephyr/types.h>
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#include <errno.h>
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#include <sys/util.h>
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int char2hex(char c, uint8_t *x)
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{
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if (c >= '0' && c <= '9') {
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*x = c - '0';
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} else if (c >= 'a' && c <= 'f') {
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*x = c - 'a' + 10;
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} else if (c >= 'A' && c <= 'F') {
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*x = c - 'A' + 10;
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} else {
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return -EINVAL;
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}
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return 0;
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}
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int hex2char(uint8_t x, char *c)
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{
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if (x <= 9) {
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*c = x + '0';
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} else if (x <= 15) {
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*c = x - 10 + 'a';
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} else {
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return -EINVAL;
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}
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return 0;
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}
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size_t bin2hex(const uint8_t *buf, size_t buflen, char *hex, size_t hexlen)
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{
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if ((hexlen + 1) < buflen * 2) {
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return 0;
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}
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for (size_t i = 0; i < buflen; i++) {
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if (hex2char(buf[i] >> 4, &hex[2 * i]) < 0) {
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return 0;
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}
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if (hex2char(buf[i] & 0xf, &hex[2 * i + 1]) < 0) {
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return 0;
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}
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}
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hex[2 * buflen] = '\0';
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return 2 * buflen;
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}
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size_t hex2bin(const char *hex, size_t hexlen, uint8_t *buf, size_t buflen)
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{
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uint8_t dec;
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if (buflen < hexlen / 2 + hexlen % 2) {
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return 0;
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}
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/* if hexlen is uneven, insert leading zero nibble */
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if (hexlen % 2) {
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if (char2hex(hex[0], &dec) < 0) {
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return 0;
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}
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buf[0] = dec;
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hex++;
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buf++;
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}
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/* regular hex conversion */
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for (size_t i = 0; i < hexlen / 2; i++) {
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if (char2hex(hex[2 * i], &dec) < 0) {
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return 0;
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}
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buf[i] = dec << 4;
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if (char2hex(hex[2 * i + 1], &dec) < 0) {
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return 0;
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}
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buf[i] += dec;
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}
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return hexlen / 2 + hexlen % 2;
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}
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