mirror of
https://github.com/emsesp/EMS-ESP32.git
synced 2025-12-08 16:59:50 +03:00
72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
/*
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* EMS-ESP - https://github.com/emsesp/EMS-ESP
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* Copyright 2020 Paul Derbyshire
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU 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, see <http://www.gnu.org/licenses/>.
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*/
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#include <uuid/common.h>
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// #ifdef ESP8266
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// #include <pgmspace.h>
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// #else
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// #include <avr/pgmspace.h>
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// #endif
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#include <Arduino.h>
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namespace uuid {
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// On ESP8266, pgm_read_byte() already takes care of 4-byte alignment, and
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// memcpy_P(s, p, 4) makes 4 calls to pgm_read_byte() anyway, so don't bother
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// optimizing for 4-byte alignment here.
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// class __FlashStringHelper;
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int compare_flash_string(const __FlashStringHelper * a, const __FlashStringHelper * b) {
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const char * aa = reinterpret_cast<const char *>(a);
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const char * bb = reinterpret_cast<const char *>(b);
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while (true) {
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uint8_t ca = pgm_read_byte(aa);
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uint8_t cb = pgm_read_byte(bb);
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if (ca != cb)
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return (int)ca - (int)cb;
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if (ca == 0)
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return 0;
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aa++;
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bb++;
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}
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}
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int compare_flash_string(const __FlashStringHelper * a, const __FlashStringHelper * b, size_t n) {
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const char * aa = reinterpret_cast<const char *>(a);
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const char * bb = reinterpret_cast<const char *>(b);
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while (n > 0) {
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uint8_t ca = pgm_read_byte(aa);
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uint8_t cb = pgm_read_byte(bb);
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if (ca != cb)
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return (int)ca - (int)cb;
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if (ca == 0)
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return 0;
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aa++;
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bb++;
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n--;
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}
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return 0;
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}
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} // namespace uuid
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