Add QR code display on the receive page

This embeds MIT licenced code from Project Nayuki:
https://www.nayuki.io/page/qr-code-generator-library
The C++ part of the code is embedded in src/QR-Code-generator.
See src/QR-Code-generator/Readme.markdown for more info.

1 files changed, 76 insertions, 0 deletions

diff --git a/src/QR-Code-generator/BitBuffer.hpp b/src/QR-Code-generator/BitBuffer.hpp
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+++ b/src/QR-Code-generator/BitBuffer.hpp
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+/* 
+ * QR Code generator library (C++)
+ * 
+ * Copyright (c) 2016 Project Nayuki
+ * https://www.nayuki.io/page/qr-code-generator-library
+ * 
+ * (MIT License)
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ * - The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ * - The Software is provided "as is", without warranty of any kind, express or
+ *   implied, including but not limited to the warranties of merchantability,
+ *   fitness for a particular purpose and noninfringement. In no event shall the
+ *   authors or copyright holders be liable for any claim, damages or other
+ *   liability, whether in an action of contract, tort or otherwise, arising from,
+ *   out of or in connection with the Software or the use or other dealings in the
+ *   Software.
+ */
+
+#pragma once
+
+#include <cstdint>
+#include <vector>
+#include "QrSegment.hpp"
+
+
+namespace qrcodegen {
+
+/* 
+ * An appendable sequence of bits. Bits are packed in big endian within a byte.
+ */
+class BitBuffer final {
+	
+	/*---- Fields ----*/
+private:
+	
+	std::vector<uint8_t> data;
+	int bitLength;
+	
+	
+	
+	/*---- Constructor ----*/
+public:
+	
+	// Creates an empty bit buffer (length 0).
+	BitBuffer();
+	
+	
+	
+	/*---- Methods ----*/
+public:
+	
+	// Returns the number of bits in the buffer, which is a non-negative value.
+	int getBitLength() const;
+	
+	
+	// Returns a copy of all bytes, padding up to the nearest byte.
+	std::vector<uint8_t> getBytes() const;
+	
+	
+	// Appends the given number of bits of the given value to this sequence.
+	// If 0 <= len <= 31, then this requires 0 <= val < 2^len.
+	void appendBits(uint32_t val, int len);
+	
+	
+	// Appends the data of the given segment to this bit buffer.
+	void appendData(const QrSegment &seg);
+	
+};
+
+}