Fork of the espurna firmware for `mhsw` switches
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/*
StreamInjector
Copyright (C) 2016-2019 by Xose Pérez <xose dot perez at gmail dot com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <Stream.h>
class StreamInjector : public Stream {
public:
typedef std::function<void(uint8_t ch)> writeCallback;
StreamInjector(size_t buflen = 128) : _buffer_size(buflen) {
_buffer = new char[buflen];
}
~StreamInjector() {
delete[] _buffer;
}
// ---------------------------------------------------------------------
virtual uint8_t inject(char ch) {
_buffer[_buffer_write] = ch;
_buffer_write = (_buffer_write + 1) % _buffer_size;
return 1;
}
virtual uint8_t inject(char *data, size_t len) {
for (uint8_t i=0; i<len; i++) {
inject(data[i]);
}
return len;
}
virtual void callback(writeCallback c) {
_callback = c;
}
// ---------------------------------------------------------------------
virtual size_t write(uint8_t ch) {
if (_callback) _callback(ch);
return 1;
}
virtual int read() {
int ch = -1;
if (_buffer_read != _buffer_write) {
ch = _buffer[_buffer_read];
_buffer_read = (_buffer_read + 1) % _buffer_size;
}
return ch;
}
virtual int available() {
unsigned int bytes = 0;
if (_buffer_read > _buffer_write) {
bytes += (_buffer_write - _buffer_read + _buffer_size);
} else if (_buffer_read < _buffer_write) {
bytes += (_buffer_write - _buffer_read);
}
return bytes;
}
virtual int peek() {
int ch = -1;
if (_buffer_read != _buffer_write) {
ch = _buffer[_buffer_read];
}
return ch;
}
virtual void flush() {
_buffer_read = _buffer_write;
}
private:
char * _buffer;
unsigned char _buffer_size;
unsigned char _buffer_write = 0;
unsigned char _buffer_read = 0;
writeCallback _callback = NULL;
};