Add bootloader extension

include/icsneo/device/extensions/bootloader/communication/redpacketizer.h

@@ -0,0 +1,56 @@
+#ifndef __BOOTLOADER_REDPACKETIZER_H_
+#define __BOOTLOADER_REDPACKETIZER_H_
+
+#ifdef __cplusplus
+
+#include "icsneo/core/ringbuffer.h"
+
+#include <cstdint>
+#include <vector>
+
+namespace icsneo {
+
+namespace Bootloader {
+
+/**
+ * Splits bytes from a RED bootloader into frames:
+ *   uint8_t  Magic
+ *   uint8_t  Response
+ *   uint16_t length (little-endian)
+ *   uint8_t  data[length]
+ */
+class REDPacketizer {
+public:
+	static constexpr uint8_t Magic = 0xAA;
+
+	enum class Response : uint8_t {
+		Accepted = 0x77,
+		Rejected = 0x7F,
+	};
+
+	struct RxFrame {
+		uint16_t len = 0;
+		Response resp = Response::Rejected;
+		std::vector<uint8_t> data;
+		bool done = false;
+	};
+
+	/**
+	 * Call with bytes received from the device.
+	 * The returned boolean indicates if there is output waiting in output()
+	 */
+	bool input(icsneo::RingBuffer& bytes);
+	std::vector<RxFrame> output();
+private:
+	enum ReadState { HEADER, CMD, LENGTH_LOWER, LENGTH_UPPER, DATA };
+	ReadState state = HEADER;
+	std::vector<RxFrame> working;
+};
+
+} // namespace Bootloader
+
+} // namespace icsneo
+
+#endif // __cplusplus
+
+#endif // __BOOTLOADER_REDPACKETIZER_H_