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62 lines
1.7 KiB
62 lines
1.7 KiB
/*
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* Copyright (C) 2010 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <esp_log.h>
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static const char *TAG = "base16";
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void base16_encode(uint8_t *raw, size_t len, char *encoded) {
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uint8_t *raw_bytes = raw;
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char *encoded_bytes = encoded;
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size_t remaining = len;
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for (; remaining--; encoded_bytes += 2)
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snprintf(encoded_bytes, 3, "%02X", *(raw_bytes++));
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}
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int base16_decode(const char *encoded, uint8_t *raw) {
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const char *encoded_bytes = encoded;
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uint8_t *raw_bytes = raw;
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char buf[3];
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char *endp;
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size_t len;
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while (encoded_bytes[0]) {
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if (!encoded_bytes[1]) {
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ESP_LOGE(TAG, "Base16-encoded string \"%s\" has invalid length\n",
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encoded);
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return -22;
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}
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memcpy(buf, encoded_bytes, 2);
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buf[2] = '\0';
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*(raw_bytes++) = strtoul(buf, &endp, 16);
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if (*endp != '\0') {
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ESP_LOGE(TAG,"Base16-encoded string \"%s\" has invalid byte \"%s\"\n",
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encoded, buf);
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return -22;
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}
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encoded_bytes += 2;
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}
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len = (raw_bytes - raw);
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return (len);
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}
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