Fork of the espurna firmware for `mhsw` switches
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// -----------------------------------------------------------------------------
// Stream Injector
// -----------------------------------------------------------------------------
#pragma once
#define STREAM_INJECTOR_BUFFER_SIZE 32
class StreamInjector : public Stream {
public:
typedef std::function<void(uint8_t ch)> writeCallback;
StreamInjector(Stream& serial) : _stream(serial) {}
virtual void callback(writeCallback c) {
_callback = c;
}
virtual size_t write(uint8_t ch) {
if (_callback) _callback(ch);
return _stream.write(ch);
}
virtual int read() {
int ch = _stream.read();
if (ch == -1) {
if (_buffer_read != _buffer_write) {
ch = _buffer[_buffer_read];
_buffer_read = (_buffer_read + 1) % STREAM_INJECTOR_BUFFER_SIZE;
}
}
return ch;
}
virtual int available() {
unsigned int bytes = _stream.available();
if (_buffer_read > _buffer_write) {
bytes += (_buffer_write - _buffer_read + STREAM_INJECTOR_BUFFER_SIZE);
} else if (_buffer_read < _buffer_write) {
bytes += (_buffer_write - _buffer_read);
}
return bytes;
}
virtual int peek() {
int ch = _stream.peek();
if (ch == -1) {
if (_buffer_read != _buffer_write) {
ch = _buffer[_buffer_read];
}
}
return ch;
}
virtual void flush() {
_stream.flush();
_buffer_read = _buffer_write;
}
virtual void inject(char *data, size_t len) {
for (int i=0; i<len; i++) {
_buffer[_buffer_write] = data[i];
_buffer_write = (_buffer_write + 1) % STREAM_INJECTOR_BUFFER_SIZE;
}
}
private:
Stream& _stream;
unsigned char _buffer[STREAM_INJECTOR_BUFFER_SIZE];
unsigned char _buffer_write = 0;
unsigned char _buffer_read = 0;
writeCallback _callback = NULL;
};