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104 lines
2.8 KiB
104 lines
2.8 KiB
/*
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StreamInjector
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Copyright (C) 2016-2018 by Xose Pérez <xose dot perez at gmail dot com>
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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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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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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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#pragma once
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#include <Stream.h>
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class StreamInjector : public Stream {
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public:
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typedef std::function<void(uint8_t ch)> writeCallback;
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StreamInjector(size_t buflen = 128) : _buffer_size(buflen) {
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_buffer = new char[buflen];
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}
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~StreamInjector() {
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delete[] _buffer;
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}
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// ---------------------------------------------------------------------
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virtual uint8_t inject(char ch) {
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_buffer[_buffer_write] = ch;
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_buffer_write = (_buffer_write + 1) % _buffer_size;
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return 1;
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}
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virtual uint8_t inject(char *data, size_t len) {
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for (int i=0; i<len; i++) {
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inject(data[i]);
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}
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return len;
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}
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virtual void callback(writeCallback c) {
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_callback = c;
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}
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// ---------------------------------------------------------------------
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virtual size_t write(uint8_t ch) {
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if (_callback) _callback(ch);
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}
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virtual int read() {
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int ch = -1;
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if (_buffer_read != _buffer_write) {
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ch = _buffer[_buffer_read];
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_buffer_read = (_buffer_read + 1) % _buffer_size;
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}
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return ch;
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}
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virtual int available() {
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unsigned int bytes = 0;
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if (_buffer_read > _buffer_write) {
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bytes += (_buffer_write - _buffer_read + _buffer_size);
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} else if (_buffer_read < _buffer_write) {
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bytes += (_buffer_write - _buffer_read);
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}
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return bytes;
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}
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virtual int peek() {
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int ch = -1;
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if (_buffer_read != _buffer_write) {
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ch = _buffer[_buffer_read];
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}
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return ch;
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}
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virtual void flush() {
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_buffer_read = _buffer_write;
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}
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private:
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char * _buffer;
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unsigned char _buffer_size;
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unsigned char _buffer_write = 0;
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unsigned char _buffer_read = 0;
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writeCallback _callback = NULL;
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};
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