mirror of
https://github.com/espressif/arduino-esp32
synced 2024-09-21 10:28:04 +00:00
77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
/*
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Copyright (c) 2015 Hristo Gochkov. All rights reserved.
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This file is part of the esp32 core for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <Arduino.h>
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#include <HEXBuilder.h>
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static uint8_t hex_char_to_byte(uint8_t c) {
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return (c >= 'a' && c <= 'f') ? (c - ((uint8_t)'a' - 0xa))
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: (c >= 'A' && c <= 'F') ? (c - ((uint8_t)'A' - 0xA))
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: (c >= '0' && c <= '9') ? (c - (uint8_t)'0')
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: 0x10; // unknown char is 16
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}
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size_t HEXBuilder::hex2bytes(unsigned char *out, size_t maxlen, String &in) {
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return hex2bytes(out, maxlen, in.c_str());
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}
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size_t HEXBuilder::hex2bytes(unsigned char *out, size_t maxlen, const char *in) {
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size_t len = 0;
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for (; *in; in++) {
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uint8_t c = hex_char_to_byte(*in);
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// Silently skip anything unknown.
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if (c > 15) {
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continue;
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}
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if (len & 1) {
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if (len / 2 < maxlen) {
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out[len / 2] |= c;
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}
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} else {
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if (len / 2 < maxlen) {
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out[len / 2] = c << 4;
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}
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}
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len++;
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}
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return (len + 1) / 2;
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}
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size_t HEXBuilder::bytes2hex(char *out, size_t maxlen, const unsigned char *in, size_t len) {
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for (size_t i = 0; i < len; i++) {
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if (i * 2 + 1 < maxlen) {
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sprintf(out + (i * 2), "%02x", in[i]);
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}
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}
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return len * 2 + 1;
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}
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String HEXBuilder::bytes2hex(const unsigned char *in, size_t len) {
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size_t maxlen = len * 2 + 1;
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char *out = (char *)malloc(maxlen);
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if (!out) {
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return String();
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}
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bytes2hex(out, maxlen, in, len);
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String ret = String(out);
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free(out);
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return ret;
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}
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