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78 lines
2.2 KiB
78 lines
2.2 KiB
// -----------------------------------------------------------------------------
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// Stream Injector
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// -----------------------------------------------------------------------------
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#pragma once
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#define STREAM_INJECTOR_BUFFER_SIZE 32
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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(Stream& serial) : _stream(serial) {}
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virtual void callback(writeCallback c) {
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_callback = c;
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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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return _stream.write(ch);
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}
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virtual int read() {
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int ch = _stream.read();
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if (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) % STREAM_INJECTOR_BUFFER_SIZE;
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}
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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 = _stream.available();
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if (_buffer_read > _buffer_write) {
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bytes += (_buffer_write - _buffer_read + STREAM_INJECTOR_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 = _stream.peek();
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if (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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}
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return ch;
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}
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virtual void flush() {
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_stream.flush();
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_buffer_read = _buffer_write;
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}
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virtual void inject(char *data, size_t len) {
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for (int i=0; i<len; i++) {
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_buffer[_buffer_write] = data[i];
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_buffer_write = (_buffer_write + 1) % STREAM_INJECTOR_BUFFER_SIZE;
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}
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}
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private:
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Stream& _stream;
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unsigned char _buffer[STREAM_INJECTOR_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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