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/*
* Copyright (c) 2016-2022 Bouffalolab.
*
* This file is part of
* *** Bouffalolab Software Dev Kit ***
* (see www.bouffalolab.com).
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of Bouffalo Lab nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdint.h>
#include <stddef.h>
#include <utils_hex.h>
const char hex_asc[] = "0123456789abcdef";
const char hex_asc_upper[] = "0123456789ABCDEF";
#define hex_asc_lo(x) hex_asc_upper[((x) & 0x0f)]
#define hex_asc_hi(x) hex_asc_upper[((x) & 0xf0) >> 4]
static inline char *hex_byte_pack(char *buf, uint8_t byte)
{
*buf++ = hex_asc_hi(byte);
*buf++ = hex_asc_lo(byte);
return buf;
}
static 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 -1;
}
return 0;
}
char *utils_bin2hex(char *dst, const void *src, size_t count)
{
const unsigned char *_src = src;
while (count--) {
dst = hex_byte_pack(dst, *_src++);
}
return dst;
}
size_t utils_hex2bin(const char *hex, size_t hexlen, uint8_t *buf, size_t buflen)
{
uint8_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;
}
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