ab309e40d5
I redid the ESP8266 WString library to enable small string optimization (SSO) a while back, and think it would be helpful even on the ESP32 with its higher memory complement. SSO avoids lots of tiny mallocs() on the heap which cause fragmentation by using the memory in the class object itself to store the actual string and only mallocing() for buffers that are larger than what can fit in thie class object. Modern C++ std::string implementations have this optimization as well, but since we're using Arduino strings we had to roll our own.
67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
/**
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StreamString.cpp
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Copyright (c) 2015 Markus Sattler. All rights reserved.
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This file is part of the esp8266 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 "StreamString.h"
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size_t StreamString::write(const uint8_t *data, size_t size) {
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if(size && data) {
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if(reserve(length() + size + 1)) {
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memcpy((void *) (wbuffer() + len()), (const void *) data, size);
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setLen(len() + size);
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*(wbuffer() + len()) = 0x00; // add null for string end
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return size;
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}
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}
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return 0;
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}
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size_t StreamString::write(uint8_t data) {
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return concat((char) data);
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}
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int StreamString::available() {
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return length();
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}
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int StreamString::read() {
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if(length()) {
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char c = charAt(0);
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remove(0, 1);
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return c;
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}
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return -1;
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}
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int StreamString::peek() {
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if(length()) {
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char c = charAt(0);
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return c;
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}
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return -1;
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}
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void StreamString::flush() {
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}
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