diff --git a/QRCode/pingout.cpp b/QRCode/pingout.cpp
new file mode 100644
index 0000000..ea357ad
--- /dev/null
+++ b/QRCode/pingout.cpp
@@ -0,0 +1,213 @@
+/* 
+ * Tiny PNG Output (C++)
+ * 
+ * Copyright (c) 2018 Project Nayuki
+ * https://www.nayuki.io/page/tiny-png-output
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program (see COPYING.txt and COPYING.LESSER.txt).
+ * If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma warning(disable:4146)
+
+#include <algorithm>
+#include <cassert>
+#include <limits>
+#include <stdexcept>
+#include "pngout.hpp"
+
+#pragma warning(disable:C4146)
+
+using std::uint8_t;
+using std::uint16_t;
+using std::uint32_t;
+using std::uint64_t;
+using std::size_t;
+
+
+TinyPngOut::TinyPngOut(uint32_t w, uint32_t h, std::ostream &out) :
+		// Set most of the fields
+		width(w),
+		height(h),
+		output(out),
+		positionX(0),
+		positionY(0),
+		deflateFilled(0),
+		adler(1) {
+	
+	// Check arguments
+	if (width == 0 || height == 0)
+		throw std::domain_error("Zero width or height");
+	
+	// Compute and check data siezs
+	uint64_t lineSz = static_cast<uint64_t>(width) * 3 + 1;
+	if (lineSz > UINT32_MAX)
+		throw std::length_error("Image too large");
+	lineSize = static_cast<uint32_t>(lineSz);
+	
+	uint64_t uncompRm = lineSize * height;
+	if (uncompRm > UINT32_MAX)
+		throw std::length_error("Image too large");
+	uncompRemain = static_cast<uint32_t>(uncompRm);
+	
+	uint32_t numBlocks = uncompRemain / DEFLATE_MAX_BLOCK_SIZE;
+	if (uncompRemain % DEFLATE_MAX_BLOCK_SIZE != 0)
+		numBlocks++;  // Round up
+	// 5 bytes per DEFLATE uncompressed block header, 2 bytes for zlib header, 4 bytes for zlib Adler-32 footer
+	uint64_t idatSize = static_cast<uint64_t>(numBlocks) * 5 + 6;
+	idatSize += uncompRemain;
+	if (idatSize > static_cast<uint32_t>(INT32_MAX))
+		throw std::length_error("Image too large");
+	
+	// Write header (not a pure header, but a couple of things concatenated together)
+	uint8_t header[] = {  // 43 bytes long
+		// PNG header
+		0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A,
+		// IHDR chunk
+		0x00, 0x00, 0x00, 0x0D,
+		0x49, 0x48, 0x44, 0x52,
+		0, 0, 0, 0,  // 'width' placeholder
+		0, 0, 0, 0,  // 'height' placeholder
+		0x08, 0x02, 0x00, 0x00, 0x00,
+		0, 0, 0, 0,  // IHDR CRC-32 placeholder
+		// IDAT chunk
+		0, 0, 0, 0,  // 'idatSize' placeholder
+		0x49, 0x44, 0x41, 0x54,
+		// DEFLATE data
+		0x08, 0x1D,
+	};
+	putBigUint32(width, &header[16]);
+	putBigUint32(height, &header[20]);
+	putBigUint32(idatSize, &header[33]);
+	crc = 0;
+	crc32(&header[12], 17);
+	putBigUint32(crc, &header[29]);
+	write(header);
+	
+	crc = 0;
+	crc32(&header[37], 6);  // 0xD7245B6B
+}
+
+
+void TinyPngOut::write(const uint8_t pixels[], size_t count) {
+	if (count > SIZE_MAX / 3)
+		throw std::length_error("Invalid argument");
+	count *= 3;  // Convert pixel count to byte count
+	while (count > 0) {
+		if (pixels == nullptr)
+			throw std::invalid_argument("Null pointer");
+		if (positionY >= height)
+			throw std::logic_error("All image pixels already written");
+		
+		if (deflateFilled == 0) {  // Start DEFLATE block
+			uint16_t size = DEFLATE_MAX_BLOCK_SIZE;
+			if (uncompRemain < size)
+				size = static_cast<uint16_t>(uncompRemain);
+			const uint8_t header[] = {  // 5 bytes long
+				static_cast<uint8_t>(uncompRemain <= DEFLATE_MAX_BLOCK_SIZE ? 1 : 0),
+				static_cast<uint8_t>(size >> 0),
+				static_cast<uint8_t>(size >> 8),
+				static_cast<uint8_t>((size >> 0) ^ 0xFF),
+				static_cast<uint8_t>((size >> 8) ^ 0xFF),
+			};
+			write(header);
+			crc32(header, sizeof(header) / sizeof(header[0]));
+		}
+		assert(positionX < lineSize && deflateFilled < DEFLATE_MAX_BLOCK_SIZE);
+		
+		if (positionX == 0) {  // Beginning of line - write filter method byte
+			uint8_t b[] = {0};
+			write(b);
+			crc32(b, 1);
+			adler32(b, 1);
+			positionX++;
+			uncompRemain--;
+			deflateFilled++;
+			
+		} else {  // Write some pixel bytes for current line
+			uint16_t n = DEFLATE_MAX_BLOCK_SIZE - deflateFilled;
+			if (lineSize - positionX < n)
+				n = static_cast<uint16_t>(lineSize - positionX);
+			if (count < n)
+				n = static_cast<uint16_t>(count);
+			if (static_cast<std::make_unsigned<std::streamsize>::type>(std::numeric_limits<std::streamsize>::max()) < std::numeric_limits<decltype(n)>::max())
+				n = std::min(n, static_cast<decltype(n)>(std::numeric_limits<std::streamsize>::max()));
+			assert(n > 0);
+			output.write(reinterpret_cast<const char*>(pixels), static_cast<std::streamsize>(n));
+			
+			// Update checksums
+			crc32(pixels, n);
+			adler32(pixels, n);
+			
+			// Increment positions
+			count -= n;
+			pixels += n;
+			positionX += n;
+			uncompRemain -= n;
+			deflateFilled += n;
+		}
+		
+		if (deflateFilled >= DEFLATE_MAX_BLOCK_SIZE)
+			deflateFilled = 0;  // End current block
+		
+		if (positionX == lineSize) {  // Increment line
+			positionX = 0;
+			positionY++;
+			if (positionY == height) {  // Reached end of pixels
+				uint8_t footer[] = {  // 20 bytes long
+					0, 0, 0, 0,  // DEFLATE Adler-32 placeholder
+					0, 0, 0, 0,  // IDAT CRC-32 placeholder
+					// IEND chunk
+					0x00, 0x00, 0x00, 0x00,
+					0x49, 0x45, 0x4E, 0x44,
+					0xAE, 0x42, 0x60, 0x82,
+				};
+				putBigUint32(adler, &footer[0]);
+				crc32(&footer[0], 4);
+				putBigUint32(crc, &footer[4]);
+				write(footer);
+			}
+		}
+	}
+}
+
+
+void TinyPngOut::crc32(const uint8_t data[], size_t len) {
+	crc = ~crc;
+	for (size_t i = 0; i < len; i++) {
+		for (int j = 0; j < 8; j++) {  // Inefficient bitwise implementation, instead of table-based
+			uint32_t bit = (crc ^ (data[i] >> j)) & 1;
+			crc = (crc >> 1) ^ ((-bit) & UINT32_C(0xEDB88320));
+		}
+	}
+	crc = ~crc;
+}
+
+
+void TinyPngOut::adler32(const uint8_t data[], size_t len) {
+	uint32_t s1 = adler & 0xFFFF;
+	uint32_t s2 = adler >> 16;
+	for (size_t i = 0; i < len; i++) {
+		s1 = (s1 + data[i]) % 65521;
+		s2 = (s2 + s1) % 65521;
+	}
+	adler = s2 << 16 | s1;
+}
+
+
+void TinyPngOut::putBigUint32(uint32_t val, uint8_t array[4]) {
+	for (int i = 0; i < 4; i++)
+		array[i] = static_cast<uint8_t>(val >> ((3 - i) * 8));
+}
+
diff --git a/QRCode/pngout.hpp b/QRCode/pngout.hpp
new file mode 100644
index 0000000..2f2c5a3
--- /dev/null
+++ b/QRCode/pngout.hpp
@@ -0,0 +1,98 @@
+/* 
+ * Tiny PNG Output (C++)
+ * 
+ * Copyright (c) 2018 Project Nayuki
+ * https://www.nayuki.io/page/tiny-png-output
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program (see COPYING.txt and COPYING.LESSER.txt).
+ * If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+#include <ostream>
+
+
+/* 
+ * Takes image pixel data in raw RGB8.8.8 format and writes a PNG file to a byte output stream.
+ */
+class TinyPngOut final {
+    
+    /*---- Fields ----*/
+    
+	// Immutable configuration
+	private: std::uint32_t width;   // Measured in pixels
+	private: std::uint32_t height;  // Measured in pixels
+	private: std::uint32_t lineSize;  // Measured in bytes, equal to (width * 3 + 1)
+	
+	// Running state
+	private: std::ostream &output;
+	private: std::uint32_t positionX;      // Next byte index in current line
+	private: std::uint32_t positionY;      // Line index of next byte
+	private: std::uint32_t uncompRemain;   // Number of uncompressed bytes remaining
+	private: std::uint16_t deflateFilled;  // Bytes filled in the current block (0 <= n < DEFLATE_MAX_BLOCK_SIZE)
+	private: std::uint32_t crc;    // Primarily for IDAT chunk
+	private: std::uint32_t adler;  // For DEFLATE data within IDAT
+	
+	
+	
+	/*---- Public constructor and method ----*/
+	
+	/* 
+	 * Creates a PNG writer with the given width and height (both non-zero) and byte output stream.
+	 * TinyPngOut will leave the output stream still open once it finishes writing the PNG file data.
+	 * Throws an exception if the dimensions exceed certain limits (e.g. w * h > 700 million).
+	 */
+	public: explicit TinyPngOut(std::uint32_t w, std::uint32_t h, std::ostream &out);
+	
+	
+	/* 
+	 * Writes 'count' pixels from the given array to the output stream. This reads count*3
+	 * bytes from the array. Pixels are presented from top to bottom, left to right, and with
+	 * subpixels in RGB order. This object keeps track of how many pixels were written and
+	 * various position variables. It is an error to write more pixels in total than width*height.
+	 * Once exactly width*height pixels have been written with this TinyPngOut object,
+	 * there are no more valid operations on the object and it should be discarded.
+	 */
+	public: void write(const std::uint8_t pixels[], size_t count);
+	
+	
+	
+	/*---- Private checksum methods ----*/
+	
+	// Reads the 'crc' field and updates its value based on the given array of new data.
+	private: void crc32(const std::uint8_t data[], size_t len);
+	
+	
+	// Reads the 'adler' field and updates its value based on the given array of new data.
+	private: void adler32(const std::uint8_t data[], size_t len);
+	
+	
+	
+	/*---- Private utility members ----*/
+	
+	private: template <std::size_t N>
+	void write(const std::uint8_t (&data)[N]) {
+		output.write(reinterpret_cast<const char*>(data), sizeof(data));
+	}
+	
+	
+	private: static void putBigUint32(std::uint32_t val, std::uint8_t array[4]);
+	
+	
+	private: static constexpr std::uint16_t DEFLATE_MAX_BLOCK_SIZE = 65535;
+	
+};
diff --git a/QRCode/qr.png.cpp b/QRCode/qr.png.cpp
new file mode 100644
index 0000000..c9c6e6f
--- /dev/null
+++ b/QRCode/qr.png.cpp
@@ -0,0 +1,125 @@
+//
+// Created by remy on 02-06-20.
+//
+
+#include "qr.png.h"
+#include "pngout.hpp"
+
+QrToPng::QrToPng(std::string fileName, int imgSize, int minModulePixelSize, std::string text,
+                 bool overwriteExistingFile, qrcodegen::QrCode::Ecc ecc) :
+        _fileName(std::move(fileName)), _size(imgSize), _minModulePixelSize(minModulePixelSize), _text(std::move(text)),
+        _overwriteExistingFile(overwriteExistingFile), _ecc(ecc) {
+}
+
+bool QrToPng::writeToPNG() {
+    /* text is required */
+    if (_text.empty())
+        return false;
+
+
+    if (!_overwriteExistingFile and fs::exists(_fileName))
+        return false;
+
+    auto _qr = qrcodegen::QrCode::encodeText("", _ecc);
+    try {
+        _qr = qrcodegen::QrCode::encodeText(_text.c_str(), _ecc);
+    }
+    catch (const std::length_error &e) {
+        std::cerr << "Failed to generate QR code, too much data. Decrease _ecc, enlarge size or give less text."
+                  << std::endl;
+        std::cerr << "e.what(): " << e.what() << std::endl;
+        return false;
+    }
+
+    if (_overwriteExistingFile and fs::exists(_fileName))
+        if (!fs::copy_file(_fileName, _fileName + ".tmp", fs::copy_options::overwrite_existing))
+            return false;
+
+    auto result = _writeToPNG(_qr);
+
+    if (result)
+        fs::remove(_fileName + ".tmp");
+
+    return result;
+
+}
+
+bool QrToPng::_writeToPNG(const qrcodegen::QrCode &qrData) const {
+    std::ofstream out(_fileName.c_str(), std::ios::binary);
+    int pngWH = _imgSizeWithBorder(qrData);
+    TinyPngOut pngout(pngWH, pngWH, out);
+
+    auto qrSize = qrData.getSize();
+    auto qrSizeWithBorder = qrData.getSize() + 2;
+    if (qrSizeWithBorder > _size)
+        return false; // qrcode doesn't fit
+
+    int qrSizeFitsInMaxImgSizeTimes = _size / qrSizeWithBorder;
+    int pixelsWHPerModule = qrSizeFitsInMaxImgSizeTimes;
+
+    if (qrSizeFitsInMaxImgSizeTimes < _minModulePixelSize)
+        return false; // image would be to small to scan
+
+    std::vector<uint8_t> tmpData;
+    const uint8_t blackPixel = 0x00;
+    const uint8_t whitePixel = 0xFF;
+
+    /* The below loop converts the qrData to RGB8.8.8 pixels and writes it with
+     * the tinyPNGoutput library. since we probably have requested a larger
+     * qr module pixel size we must transform the qrData modules to be larger
+     * pixels (than just 1x1). */
+
+    // border above
+    for (int i = 0; i < pngWH; i++) // row
+        for (int j = 0; j < pixelsWHPerModule; j++) // module pixel (height)
+            tmpData.insert(tmpData.end(), {whitePixel, whitePixel, whitePixel});
+
+    pngout.write(tmpData.data(), static_cast<size_t>(tmpData.size() / 3));
+    tmpData.clear();
+
+    for (int qrModuleAtY = 0; qrModuleAtY < qrSize; qrModuleAtY++) {
+        for (int col = 0; col < pixelsWHPerModule; col++) {
+            // border left
+            for (int i = 0; i < qrSizeFitsInMaxImgSizeTimes; ++i)
+                tmpData.insert(tmpData.end(), {whitePixel, whitePixel, whitePixel});
+
+            // qr module to pixel
+            for (int qrModuleAtX = 0; qrModuleAtX < (qrSize); qrModuleAtX++) {
+            for (int row = 0; row < qrSizeFitsInMaxImgSizeTimes; ++row) {
+                    if (qrData.getModule(qrModuleAtX, qrModuleAtY)) {
+                        // insert saves us a for loop or 3 times the same line.
+                        tmpData.insert(tmpData.end(), {blackPixel, blackPixel, blackPixel});
+                    } else {
+                        tmpData.insert(tmpData.end(), {whitePixel, whitePixel, whitePixel});
+                    }
+                }
+            }
+            // border right
+            for (int i = 0; i < qrSizeFitsInMaxImgSizeTimes; ++i)
+                tmpData.insert(tmpData.end(), {whitePixel, whitePixel, whitePixel});
+
+            // write the entire  row
+            pngout.write(tmpData.data(), static_cast<size_t>(tmpData.size() / 3));
+            tmpData.clear();
+        }
+    }
+
+    // border below
+    for (int i = 0; i < pngWH; i++) // row
+        for (int j = 0; j < pixelsWHPerModule; j++) // module pixel (height)
+            tmpData.insert(tmpData.end(), {whitePixel, whitePixel, whitePixel});
+
+    pngout.write(tmpData.data(), static_cast<size_t>(tmpData.size() / 3));
+    tmpData.clear();
+
+    return fs::exists(_fileName);
+}
+
+
+uint32_t QrToPng::_imgSize(const qrcodegen::QrCode &qrData) const {
+    return (_size / qrData.getSize()) * qrData.getSize();
+}
+
+uint32_t QrToPng::_imgSizeWithBorder(const qrcodegen::QrCode &qrData) const {
+    return (_size / (qrData.getSize() + 2)) * (qrData.getSize() + 2);
+}
\ No newline at end of file
diff --git a/QRCode/qr.png.h b/QRCode/qr.png.h
new file mode 100644
index 0000000..c8a8d9a
--- /dev/null
+++ b/QRCode/qr.png.h
@@ -0,0 +1,71 @@
+//
+// Created by remy on 07-06-20.
+//
+
+#ifndef QR_TO_PNG_H
+#define QR_TO_PNG_H
+
+/* If your compiler is recent enough,
+ * you don't need to include '::experimental::',
+ * you can just include "::filesystem". The below
+ * code makes both work, accessible at 'fs::'. */
+#if defined(__GNUC__) && __GNUC__ < 9
+#include <experimental/filesystem>
+namespace fs = std::experimental::filesystem;
+#else
+#include <filesystem>
+namespace fs = std::filesystem;
+#endif
+
+#include "QrCode.hpp"
+#include "qrcode.hpp"
+#include <fstream>
+#include <iostream>
+#include <memory>
+#include <string>
+
+class QrToPng {
+public:
+    /**
+     * Gives an object containing all the data to create the QR code. When @writeToPNG() is called,
+     * the actual file is constructed and written.
+     * The image is scaled to fit in the given size as much as possible relative to the QR code
+     * size.
+     * @param fileName relative or absolute filename to write image to. Relative will be in CWD.
+     * @param imgSize The height and width of the image. Image is square, so will be width and height.
+     * @param minModulePixelSize How many pixels big should a qr module be (a white or black dot)?
+     * @param text The text to encode in the QR code.
+     * @param overwriteExistingFile Overwrite if a file with @fileName already exists?
+     * @param ecc error correction (low,mid,high).
+     */
+    QrToPng(std::string fileName, int imgSize, int minModulePixelSize, std::string text,
+            bool overwriteExistingFile, qrcodegen::QrCode::Ecc ecc);
+
+    /** Writes a QrToPng object to a png file at @_fileName.
+     * @return true if file could be written, false if file could not be written */
+    bool writeToPNG();
+
+private:
+    std::string _fileName;
+    int _size;
+    int _minModulePixelSize;
+    std::string _text;
+    bool _overwriteExistingFile;
+    qrcodegen::QrCode::Ecc _ecc;
+
+    /** Writes the PNG file. Constructs a vector with
+     * each element being a row of RGB 8.8.8 pixels, the
+     * format is geared towards the tinypngoutput library.
+     * @param qrData the code returned by the qrcodegen library
+     * @return true if file could be written, false if file could not be written */
+    [[nodiscard]] bool _writeToPNG(const qrcodegen::QrCode &qrData) const;
+
+    /* returns the width/height of the image based on the max image size
+    * and qr width. Ex. If the max img size is 90, the qr code size 29
+    * the qr module pixel size will be 3, the image size will be 3*29=87. */
+    [[nodiscard]] uint32_t _imgSize(const qrcodegen::QrCode &qrData) const;
+
+    [[nodiscard]] uint32_t _imgSizeWithBorder(const qrcodegen::QrCode &qrData) const;
+};
+
+#endif //QR_TO_PNG_H
\ No newline at end of file
diff --git a/QRCode/qrcode.cpp b/QRCode/qrcode.cpp
new file mode 100644
index 0000000..4d5b93f
--- /dev/null
+++ b/QRCode/qrcode.cpp
@@ -0,0 +1,831 @@
+/* 
+ * QR Code generator library (C++)
+ * 
+ * Copyright (c) Project Nayuki. (MIT License)
+ * https://www.nayuki.io/page/qr-code-generator-library
+ * 
+ * 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.
+ */
+
+#include <algorithm>
+#include <cassert>
+#include <climits>
+#include <cstddef>
+#include <cstdlib>
+#include <cstring>
+#include <sstream>
+#include <utility>
+#include "qrcode.hpp"
+#include <vector>
+
+using std::int8_t;
+using std::uint8_t;
+using std::size_t;
+using std::vector;
+
+
+namespace qrcodegen {
+
+/*---- Class QrSegment ----*/
+
+QrSegment::Mode::Mode(int mode, int cc0, int cc1, int cc2) :
+		modeBits(mode) {
+	numBitsCharCount[0] = cc0;
+	numBitsCharCount[1] = cc1;
+	numBitsCharCount[2] = cc2;
+}
+
+
+int QrSegment::Mode::getModeBits() const {
+	return modeBits;
+}
+
+
+int QrSegment::Mode::numCharCountBits(int ver) const {
+	return numBitsCharCount[(ver + 7) / 17];
+}
+
+
+const QrSegment::Mode QrSegment::Mode::NUMERIC     (0x1, 10, 12, 14);
+const QrSegment::Mode QrSegment::Mode::ALPHANUMERIC(0x2,  9, 11, 13);
+const QrSegment::Mode QrSegment::Mode::BYTE        (0x4,  8, 16, 16);
+const QrSegment::Mode QrSegment::Mode::KANJI       (0x8,  8, 10, 12);
+const QrSegment::Mode QrSegment::Mode::ECI         (0x7,  0,  0,  0);
+
+
+QrSegment QrSegment::makeBytes(const vector<uint8_t> &data) {
+	if (data.size() > static_cast<unsigned int>(INT_MAX))
+		throw std::length_error("Data too long");
+	BitBuffer bb;
+	for (uint8_t b : data)
+		bb.appendBits(b, 8);
+	return QrSegment(Mode::BYTE, static_cast<int>(data.size()), std::move(bb));
+}
+
+
+QrSegment QrSegment::makeNumeric(const char *digits) {
+	BitBuffer bb;
+	int accumData = 0;
+	int accumCount = 0;
+	int charCount = 0;
+	for (; *digits != '\0'; digits++, charCount++) {
+		char c = *digits;
+		if (c < '0' || c > '9')
+			throw std::domain_error("String contains non-numeric characters");
+		accumData = accumData * 10 + (c - '0');
+		accumCount++;
+		if (accumCount == 3) {
+			bb.appendBits(static_cast<uint32_t>(accumData), 10);
+			accumData = 0;
+			accumCount = 0;
+		}
+	}
+	if (accumCount > 0)  // 1 or 2 digits remaining
+		bb.appendBits(static_cast<uint32_t>(accumData), accumCount * 3 + 1);
+	return QrSegment(Mode::NUMERIC, charCount, std::move(bb));
+}
+
+
+QrSegment QrSegment::makeAlphanumeric(const char *text) {
+	BitBuffer bb;
+	int accumData = 0;
+	int accumCount = 0;
+	int charCount = 0;
+	for (; *text != '\0'; text++, charCount++) {
+		const char *temp = std::strchr(ALPHANUMERIC_CHARSET, *text);
+		if (temp == nullptr)
+			throw std::domain_error("String contains unencodable characters in alphanumeric mode");
+		accumData = accumData * 45 + static_cast<int>(temp - ALPHANUMERIC_CHARSET);
+		accumCount++;
+		if (accumCount == 2) {
+			bb.appendBits(static_cast<uint32_t>(accumData), 11);
+			accumData = 0;
+			accumCount = 0;
+		}
+	}
+	if (accumCount > 0)  // 1 character remaining
+		bb.appendBits(static_cast<uint32_t>(accumData), 6);
+	return QrSegment(Mode::ALPHANUMERIC, charCount, std::move(bb));
+}
+
+
+vector<QrSegment> QrSegment::makeSegments(const char *text) {
+	// Select the most efficient segment encoding automatically
+	vector<QrSegment> result;
+	if (*text == '\0');  // Leave result empty
+	else if (isNumeric(text))
+		result.push_back(makeNumeric(text));
+	else if (isAlphanumeric(text))
+		result.push_back(makeAlphanumeric(text));
+	else {
+		vector<uint8_t> bytes;
+		for (; *text != '\0'; text++)
+			bytes.push_back(static_cast<uint8_t>(*text));
+		result.push_back(makeBytes(bytes));
+	}
+	return result;
+}
+
+
+QrSegment QrSegment::makeEci(long assignVal) {
+	BitBuffer bb;
+	if (assignVal < 0)
+		throw std::domain_error("ECI assignment value out of range");
+	else if (assignVal < (1 << 7))
+		bb.appendBits(static_cast<uint32_t>(assignVal), 8);
+	else if (assignVal < (1 << 14)) {
+		bb.appendBits(2, 2);
+		bb.appendBits(static_cast<uint32_t>(assignVal), 14);
+	} else if (assignVal < 1000000L) {
+		bb.appendBits(6, 3);
+		bb.appendBits(static_cast<uint32_t>(assignVal), 21);
+	} else
+		throw std::domain_error("ECI assignment value out of range");
+	return QrSegment(Mode::ECI, 0, std::move(bb));
+}
+
+
+QrSegment::QrSegment(const Mode &md, int numCh, const std::vector<bool> &dt) :
+		mode(&md),
+		numChars(numCh),
+		data(dt) {
+	if (numCh < 0)
+		throw std::domain_error("Invalid value");
+}
+
+
+QrSegment::QrSegment(const Mode &md, int numCh, std::vector<bool> &&dt) :
+		mode(&md),
+		numChars(numCh),
+		data(std::move(dt)) {
+	if (numCh < 0)
+		throw std::domain_error("Invalid value");
+}
+
+
+int QrSegment::getTotalBits(const vector<QrSegment> &segs, int version) {
+	int result = 0;
+	for (const QrSegment &seg : segs) {
+		int ccbits = seg.mode->numCharCountBits(version);
+		if (seg.numChars >= (1L << ccbits))
+			return -1;  // The segment's length doesn't fit the field's bit width
+		if (4 + ccbits > INT_MAX - result)
+			return -1;  // The sum will overflow an int type
+		result += 4 + ccbits;
+		if (seg.data.size() > static_cast<unsigned int>(INT_MAX - result))
+			return -1;  // The sum will overflow an int type
+		result += static_cast<int>(seg.data.size());
+	}
+	return result;
+}
+
+
+bool QrSegment::isNumeric(const char *text) {
+	for (; *text != '\0'; text++) {
+		char c = *text;
+		if (c < '0' || c > '9')
+			return false;
+	}
+	return true;
+}
+
+
+bool QrSegment::isAlphanumeric(const char *text) {
+	for (; *text != '\0'; text++) {
+		if (std::strchr(ALPHANUMERIC_CHARSET, *text) == nullptr)
+			return false;
+	}
+	return true;
+}
+
+
+const QrSegment::Mode &QrSegment::getMode() const {
+	return *mode;
+}
+
+
+int QrSegment::getNumChars() const {
+	return numChars;
+}
+
+
+const std::vector<bool> &QrSegment::getData() const {
+	return data;
+}
+
+
+const char *QrSegment::ALPHANUMERIC_CHARSET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:";
+
+
+
+/*---- Class QrCode ----*/
+
+int QrCode::getFormatBits(Ecc ecl) {
+	switch (ecl) {
+		case Ecc::LOW     :  return 1;
+		case Ecc::MEDIUM  :  return 0;
+		case Ecc::QUARTILE:  return 3;
+		case Ecc::HIGH    :  return 2;
+		default:  throw std::logic_error("Unreachable");
+	}
+}
+
+
+QrCode QrCode::encodeText(const char *text, Ecc ecl) {
+	vector<QrSegment> segs = QrSegment::makeSegments(text);
+	return encodeSegments(segs, ecl);
+}
+
+
+QrCode QrCode::encodeBinary(const vector<uint8_t> &data, Ecc ecl) {
+	vector<QrSegment> segs{QrSegment::makeBytes(data)};
+	return encodeSegments(segs, ecl);
+}
+
+
+QrCode QrCode::encodeSegments(const vector<QrSegment> &segs, Ecc ecl,
+		int minVersion, int maxVersion, int mask, bool boostEcl) {
+	if (!(MIN_VERSION <= minVersion && minVersion <= maxVersion && maxVersion <= MAX_VERSION) || mask < -1 || mask > 7)
+		throw std::invalid_argument("Invalid value");
+	
+	// Find the minimal version number to use
+	int version, dataUsedBits;
+	for (version = minVersion; ; version++) {
+		int dataCapacityBits = getNumDataCodewords(version, ecl) * 8;  // Number of data bits available
+		dataUsedBits = QrSegment::getTotalBits(segs, version);
+		if (dataUsedBits != -1 && dataUsedBits <= dataCapacityBits)
+			break;  // This version number is found to be suitable
+		if (version >= maxVersion) {  // All versions in the range could not fit the given data
+			std::ostringstream sb;
+			if (dataUsedBits == -1)
+				sb << "Segment too long";
+			else {
+				sb << "Data length = " << dataUsedBits << " bits, ";
+				sb << "Max capacity = " << dataCapacityBits << " bits";
+			}
+			throw data_too_long(sb.str());
+		}
+	}
+	assert(dataUsedBits != -1);
+	
+	// Increase the error correction level while the data still fits in the current version number
+	for (Ecc newEcl : {Ecc::MEDIUM, Ecc::QUARTILE, Ecc::HIGH}) {  // From low to high
+		if (boostEcl && dataUsedBits <= getNumDataCodewords(version, newEcl) * 8)
+			ecl = newEcl;
+	}
+	
+	// Concatenate all segments to create the data bit string
+	BitBuffer bb;
+	for (const QrSegment &seg : segs) {
+		bb.appendBits(static_cast<uint32_t>(seg.getMode().getModeBits()), 4);
+		bb.appendBits(static_cast<uint32_t>(seg.getNumChars()), seg.getMode().numCharCountBits(version));
+		bb.insert(bb.end(), seg.getData().begin(), seg.getData().end());
+	}
+	assert(bb.size() == static_cast<unsigned int>(dataUsedBits));
+	
+	// Add terminator and pad up to a byte if applicable
+	size_t dataCapacityBits = static_cast<size_t>(getNumDataCodewords(version, ecl)) * 8;
+	assert(bb.size() <= dataCapacityBits);
+	bb.appendBits(0, std::min(4, static_cast<int>(dataCapacityBits - bb.size())));
+	bb.appendBits(0, (8 - static_cast<int>(bb.size() % 8)) % 8);
+	assert(bb.size() % 8 == 0);
+	
+	// Pad with alternating bytes until data capacity is reached
+	for (uint8_t padByte = 0xEC; bb.size() < dataCapacityBits; padByte ^= 0xEC ^ 0x11)
+		bb.appendBits(padByte, 8);
+	
+	// Pack bits into bytes in big endian
+	vector<uint8_t> dataCodewords(bb.size() / 8);
+	for (size_t i = 0; i < bb.size(); i++)
+		dataCodewords.at(i >> 3) |= (bb.at(i) ? 1 : 0) << (7 - (i & 7));
+	
+	// Create the QR Code object
+	return QrCode(version, ecl, dataCodewords, mask);
+}
+
+
+QrCode::QrCode(int ver, Ecc ecl, const vector<uint8_t> &dataCodewords, int msk) :
+		// Initialize fields and check arguments
+		version(ver),
+		errorCorrectionLevel(ecl) {
+	if (ver < MIN_VERSION || ver > MAX_VERSION)
+		throw std::domain_error("Version value out of range");
+	if (msk < -1 || msk > 7)
+		throw std::domain_error("Mask value out of range");
+	size = ver * 4 + 17;
+	size_t sz = static_cast<size_t>(size);
+	modules    = vector<vector<bool> >(sz, vector<bool>(sz));  // Initially all light
+	isFunction = vector<vector<bool> >(sz, vector<bool>(sz));
+	
+	// Compute ECC, draw modules
+	drawFunctionPatterns();
+	const vector<uint8_t> allCodewords = addEccAndInterleave(dataCodewords);
+	drawCodewords(allCodewords);
+	
+	// Do masking
+	if (msk == -1) {  // Automatically choose best mask
+		long minPenalty = LONG_MAX;
+		for (int i = 0; i < 8; i++) {
+			applyMask(i);
+			drawFormatBits(i);
+			long penalty = getPenaltyScore();
+			if (penalty < minPenalty) {
+				msk = i;
+				minPenalty = penalty;
+			}
+			applyMask(i);  // Undoes the mask due to XOR
+		}
+	}
+	assert(0 <= msk && msk <= 7);
+	mask = msk;
+	applyMask(msk);  // Apply the final choice of mask
+	drawFormatBits(msk);  // Overwrite old format bits
+	
+	isFunction.clear();
+	isFunction.shrink_to_fit();
+}
+
+
+int QrCode::getVersion() const {
+	return version;
+}
+
+
+int QrCode::getSize() const {
+	return size;
+}
+
+
+QrCode::Ecc QrCode::getErrorCorrectionLevel() const {
+	return errorCorrectionLevel;
+}
+
+
+int QrCode::getMask() const {
+	return mask;
+}
+
+
+bool QrCode::getModule(int x, int y) const {
+	return 0 <= x && x < size && 0 <= y && y < size && module(x, y);
+}
+
+
+void QrCode::drawFunctionPatterns() {
+	// Draw horizontal and vertical timing patterns
+	for (int i = 0; i < size; i++) {
+		setFunctionModule(6, i, i % 2 == 0);
+		setFunctionModule(i, 6, i % 2 == 0);
+	}
+	
+	// Draw 3 finder patterns (all corners except bottom right; overwrites some timing modules)
+	drawFinderPattern(3, 3);
+	drawFinderPattern(size - 4, 3);
+	drawFinderPattern(3, size - 4);
+	
+	// Draw numerous alignment patterns
+	const vector<int> alignPatPos = getAlignmentPatternPositions();
+	size_t numAlign = alignPatPos.size();
+	for (size_t i = 0; i < numAlign; i++) {
+		for (size_t j = 0; j < numAlign; j++) {
+			// Don't draw on the three finder corners
+			if (!((i == 0 && j == 0) || (i == 0 && j == numAlign - 1) || (i == numAlign - 1 && j == 0)))
+				drawAlignmentPattern(alignPatPos.at(i), alignPatPos.at(j));
+		}
+	}
+	
+	// Draw configuration data
+	drawFormatBits(0);  // Dummy mask value; overwritten later in the constructor
+	drawVersion();
+}
+
+
+void QrCode::drawFormatBits(int msk) {
+	// Calculate error correction code and pack bits
+	int data = getFormatBits(errorCorrectionLevel) << 3 | msk;  // errCorrLvl is uint2, msk is uint3
+	int rem = data;
+	for (int i = 0; i < 10; i++)
+		rem = (rem << 1) ^ ((rem >> 9) * 0x537);
+	int bits = (data << 10 | rem) ^ 0x5412;  // uint15
+	assert(bits >> 15 == 0);
+	
+	// Draw first copy
+	for (int i = 0; i <= 5; i++)
+		setFunctionModule(8, i, getBit(bits, i));
+	setFunctionModule(8, 7, getBit(bits, 6));
+	setFunctionModule(8, 8, getBit(bits, 7));
+	setFunctionModule(7, 8, getBit(bits, 8));
+	for (int i = 9; i < 15; i++)
+		setFunctionModule(14 - i, 8, getBit(bits, i));
+	
+	// Draw second copy
+	for (int i = 0; i < 8; i++)
+		setFunctionModule(size - 1 - i, 8, getBit(bits, i));
+	for (int i = 8; i < 15; i++)
+		setFunctionModule(8, size - 15 + i, getBit(bits, i));
+	setFunctionModule(8, size - 8, true);  // Always dark
+}
+
+
+void QrCode::drawVersion() {
+	if (version < 7)
+		return;
+	
+	// Calculate error correction code and pack bits
+	int rem = version;  // version is uint6, in the range [7, 40]
+	for (int i = 0; i < 12; i++)
+		rem = (rem << 1) ^ ((rem >> 11) * 0x1F25);
+	long bits = static_cast<long>(version) << 12 | rem;  // uint18
+	assert(bits >> 18 == 0);
+	
+	// Draw two copies
+	for (int i = 0; i < 18; i++) {
+		bool bit = getBit(bits, i);
+		int a = size - 11 + i % 3;
+		int b = i / 3;
+		setFunctionModule(a, b, bit);
+		setFunctionModule(b, a, bit);
+	}
+}
+
+
+void QrCode::drawFinderPattern(int x, int y) {
+	for (int dy = -4; dy <= 4; dy++) {
+		for (int dx = -4; dx <= 4; dx++) {
+			int dist = std::max(std::abs(dx), std::abs(dy));  // Chebyshev/infinity norm
+			int xx = x + dx, yy = y + dy;
+			if (0 <= xx && xx < size && 0 <= yy && yy < size)
+				setFunctionModule(xx, yy, dist != 2 && dist != 4);
+		}
+	}
+}
+
+
+void QrCode::drawAlignmentPattern(int x, int y) {
+	for (int dy = -2; dy <= 2; dy++) {
+		for (int dx = -2; dx <= 2; dx++)
+			setFunctionModule(x + dx, y + dy, std::max(std::abs(dx), std::abs(dy)) != 1);
+	}
+}
+
+
+void QrCode::setFunctionModule(int x, int y, bool isDark) {
+	size_t ux = static_cast<size_t>(x);
+	size_t uy = static_cast<size_t>(y);
+	modules   .at(uy).at(ux) = isDark;
+	isFunction.at(uy).at(ux) = true;
+}
+
+
+bool QrCode::module(int x, int y) const {
+	return modules.at(static_cast<size_t>(y)).at(static_cast<size_t>(x));
+}
+
+
+vector<uint8_t> QrCode::addEccAndInterleave(const vector<uint8_t> &data) const {
+	if (data.size() != static_cast<unsigned int>(getNumDataCodewords(version, errorCorrectionLevel)))
+		throw std::invalid_argument("Invalid argument");
+	
+	// Calculate parameter numbers
+	int numBlocks = NUM_ERROR_CORRECTION_BLOCKS[static_cast<int>(errorCorrectionLevel)][version];
+	int blockEccLen = ECC_CODEWORDS_PER_BLOCK  [static_cast<int>(errorCorrectionLevel)][version];
+	int rawCodewords = getNumRawDataModules(version) / 8;
+	int numShortBlocks = numBlocks - rawCodewords % numBlocks;
+	int shortBlockLen = rawCodewords / numBlocks;
+	
+	// Split data into blocks and append ECC to each block
+	vector<vector<uint8_t> > blocks;
+	const vector<uint8_t> rsDiv = reedSolomonComputeDivisor(blockEccLen);
+	for (int i = 0, k = 0; i < numBlocks; i++) {
+		vector<uint8_t> dat(data.cbegin() + k, data.cbegin() + (k + shortBlockLen - blockEccLen + (i < numShortBlocks ? 0 : 1)));
+		k += static_cast<int>(dat.size());
+		const vector<uint8_t> ecc = reedSolomonComputeRemainder(dat, rsDiv);
+		if (i < numShortBlocks)
+			dat.push_back(0);
+		dat.insert(dat.end(), ecc.cbegin(), ecc.cend());
+		blocks.push_back(std::move(dat));
+	}
+	
+	// Interleave (not concatenate) the bytes from every block into a single sequence
+	vector<uint8_t> result;
+	for (size_t i = 0; i < blocks.at(0).size(); i++) {
+		for (size_t j = 0; j < blocks.size(); j++) {
+			// Skip the padding byte in short blocks
+			if (i != static_cast<unsigned int>(shortBlockLen - blockEccLen) || j >= static_cast<unsigned int>(numShortBlocks))
+				result.push_back(blocks.at(j).at(i));
+		}
+	}
+	assert(result.size() == static_cast<unsigned int>(rawCodewords));
+	return result;
+}
+
+
+void QrCode::drawCodewords(const vector<uint8_t> &data) {
+	if (data.size() != static_cast<unsigned int>(getNumRawDataModules(version) / 8))
+		throw std::invalid_argument("Invalid argument");
+	
+	size_t i = 0;  // Bit index into the data
+	// Do the funny zigzag scan
+	for (int right = size - 1; right >= 1; right -= 2) {  // Index of right column in each column pair
+		if (right == 6)
+			right = 5;
+		for (int vert = 0; vert < size; vert++) {  // Vertical counter
+			for (int j = 0; j < 2; j++) {
+				size_t x = static_cast<size_t>(right - j);  // Actual x coordinate
+				bool upward = ((right + 1) & 2) == 0;
+				size_t y = static_cast<size_t>(upward ? size - 1 - vert : vert);  // Actual y coordinate
+				if (!isFunction.at(y).at(x) && i < data.size() * 8) {
+					modules.at(y).at(x) = getBit(data.at(i >> 3), 7 - static_cast<int>(i & 7));
+					i++;
+				}
+				// If this QR Code has any remainder bits (0 to 7), they were assigned as
+				// 0/false/light by the constructor and are left unchanged by this method
+			}
+		}
+	}
+	assert(i == data.size() * 8);
+}
+
+
+void QrCode::applyMask(int msk) {
+	if (msk < 0 || msk > 7)
+		throw std::domain_error("Mask value out of range");
+	size_t sz = static_cast<size_t>(size);
+	for (size_t y = 0; y < sz; y++) {
+		for (size_t x = 0; x < sz; x++) {
+			bool invert;
+			switch (msk) {
+				case 0:  invert = (x + y) % 2 == 0;                    break;
+				case 1:  invert = y % 2 == 0;                          break;
+				case 2:  invert = x % 3 == 0;                          break;
+				case 3:  invert = (x + y) % 3 == 0;                    break;
+				case 4:  invert = (x / 3 + y / 2) % 2 == 0;            break;
+				case 5:  invert = x * y % 2 + x * y % 3 == 0;          break;
+				case 6:  invert = (x * y % 2 + x * y % 3) % 2 == 0;    break;
+				case 7:  invert = ((x + y) % 2 + x * y % 3) % 2 == 0;  break;
+				default:  throw std::logic_error("Unreachable");
+			}
+			modules.at(y).at(x) = modules.at(y).at(x) ^ (invert & !isFunction.at(y).at(x));
+		}
+	}
+}
+
+
+long QrCode::getPenaltyScore() const {
+	long result = 0;
+	
+	// Adjacent modules in row having same color, and finder-like patterns
+	for (int y = 0; y < size; y++) {
+		bool runColor = false;
+		int runX = 0;
+		std::array<int,7> runHistory = {};
+		for (int x = 0; x < size; x++) {
+			if (module(x, y) == runColor) {
+				runX++;
+				if (runX == 5)
+					result += PENALTY_N1;
+				else if (runX > 5)
+					result++;
+			} else {
+				finderPenaltyAddHistory(runX, runHistory);
+				if (!runColor)
+					result += finderPenaltyCountPatterns(runHistory) * PENALTY_N3;
+				runColor = module(x, y);
+				runX = 1;
+			}
+		}
+		result += finderPenaltyTerminateAndCount(runColor, runX, runHistory) * PENALTY_N3;
+	}
+	// Adjacent modules in column having same color, and finder-like patterns
+	for (int x = 0; x < size; x++) {
+		bool runColor = false;
+		int runY = 0;
+		std::array<int,7> runHistory = {};
+		for (int y = 0; y < size; y++) {
+			if (module(x, y) == runColor) {
+				runY++;
+				if (runY == 5)
+					result += PENALTY_N1;
+				else if (runY > 5)
+					result++;
+			} else {
+				finderPenaltyAddHistory(runY, runHistory);
+				if (!runColor)
+					result += finderPenaltyCountPatterns(runHistory) * PENALTY_N3;
+				runColor = module(x, y);
+				runY = 1;
+			}
+		}
+		result += finderPenaltyTerminateAndCount(runColor, runY, runHistory) * PENALTY_N3;
+	}
+	
+	// 2*2 blocks of modules having same color
+	for (int y = 0; y < size - 1; y++) {
+		for (int x = 0; x < size - 1; x++) {
+			bool  color = module(x, y);
+			if (  color == module(x + 1, y) &&
+			      color == module(x, y + 1) &&
+			      color == module(x + 1, y + 1))
+				result += PENALTY_N2;
+		}
+	}
+	
+	// Balance of dark and light modules
+	int dark = 0;
+	for (const vector<bool> &row : modules) {
+		for (bool color : row) {
+			if (color)
+				dark++;
+		}
+	}
+	int total = size * size;  // Note that size is odd, so dark/total != 1/2
+	// Compute the smallest integer k >= 0 such that (45-5k)% <= dark/total <= (55+5k)%
+	int k = static_cast<int>((std::abs(dark * 20L - total * 10L) + total - 1) / total) - 1;
+	assert(0 <= k && k <= 9);
+	result += k * PENALTY_N4;
+	assert(0 <= result && result <= 2568888L);  // Non-tight upper bound based on default values of PENALTY_N1, ..., N4
+	return result;
+}
+
+
+vector<int> QrCode::getAlignmentPatternPositions() const {
+	if (version == 1)
+		return vector<int>();
+	else {
+		int numAlign = version / 7 + 2;
+		int step = (version == 32) ? 26 :
+			(version * 4 + numAlign * 2 + 1) / (numAlign * 2 - 2) * 2;
+		vector<int> result;
+		for (int i = 0, pos = size - 7; i < numAlign - 1; i++, pos -= step)
+			result.insert(result.begin(), pos);
+		result.insert(result.begin(), 6);
+		return result;
+	}
+}
+
+
+int QrCode::getNumRawDataModules(int ver) {
+	if (ver < MIN_VERSION || ver > MAX_VERSION)
+		throw std::domain_error("Version number out of range");
+	int result = (16 * ver + 128) * ver + 64;
+	if (ver >= 2) {
+		int numAlign = ver / 7 + 2;
+		result -= (25 * numAlign - 10) * numAlign - 55;
+		if (ver >= 7)
+			result -= 36;
+	}
+	assert(208 <= result && result <= 29648);
+	return result;
+}
+
+
+int QrCode::getNumDataCodewords(int ver, Ecc ecl) {
+	return getNumRawDataModules(ver) / 8
+		- ECC_CODEWORDS_PER_BLOCK    [static_cast<int>(ecl)][ver]
+		* NUM_ERROR_CORRECTION_BLOCKS[static_cast<int>(ecl)][ver];
+}
+
+
+vector<uint8_t> QrCode::reedSolomonComputeDivisor(int degree) {
+	if (degree < 1 || degree > 255)
+		throw std::domain_error("Degree out of range");
+	// Polynomial coefficients are stored from highest to lowest power, excluding the leading term which is always 1.
+	// For example the polynomial x^3 + 255x^2 + 8x + 93 is stored as the uint8 array {255, 8, 93}.
+	vector<uint8_t> result(static_cast<size_t>(degree));
+	result.at(result.size() - 1) = 1;  // Start off with the monomial x^0
+	
+	// Compute the product polynomial (x - r^0) * (x - r^1) * (x - r^2) * ... * (x - r^{degree-1}),
+	// and drop the highest monomial term which is always 1x^degree.
+	// Note that r = 0x02, which is a generator element of this field GF(2^8/0x11D).
+	uint8_t root = 1;
+	for (int i = 0; i < degree; i++) {
+		// Multiply the current product by (x - r^i)
+		for (size_t j = 0; j < result.size(); j++) {
+			result.at(j) = reedSolomonMultiply(result.at(j), root);
+			if (j + 1 < result.size())
+				result.at(j) ^= result.at(j + 1);
+		}
+		root = reedSolomonMultiply(root, 0x02);
+	}
+	return result;
+}
+
+
+vector<uint8_t> QrCode::reedSolomonComputeRemainder(const vector<uint8_t> &data, const vector<uint8_t> &divisor) {
+	vector<uint8_t> result(divisor.size());
+	for (uint8_t b : data) {  // Polynomial division
+		uint8_t factor = b ^ result.at(0);
+		result.erase(result.begin());
+		result.push_back(0);
+		for (size_t i = 0; i < result.size(); i++)
+			result.at(i) ^= reedSolomonMultiply(divisor.at(i), factor);
+	}
+	return result;
+}
+
+
+uint8_t QrCode::reedSolomonMultiply(uint8_t x, uint8_t y) {
+	// Russian peasant multiplication
+	int z = 0;
+	for (int i = 7; i >= 0; i--) {
+		z = (z << 1) ^ ((z >> 7) * 0x11D);
+		z ^= ((y >> i) & 1) * x;
+	}
+	assert(z >> 8 == 0);
+	return static_cast<uint8_t>(z);
+}
+
+
+int QrCode::finderPenaltyCountPatterns(const std::array<int,7> &runHistory) const {
+	int n = runHistory.at(1);
+	assert(n <= size * 3);
+	bool core = n > 0 && runHistory.at(2) == n && runHistory.at(3) == n * 3 && runHistory.at(4) == n && runHistory.at(5) == n;
+	return (core && runHistory.at(0) >= n * 4 && runHistory.at(6) >= n ? 1 : 0)
+	     + (core && runHistory.at(6) >= n * 4 && runHistory.at(0) >= n ? 1 : 0);
+}
+
+
+int QrCode::finderPenaltyTerminateAndCount(bool currentRunColor, int currentRunLength, std::array<int,7> &runHistory) const {
+	if (currentRunColor) {  // Terminate dark run
+		finderPenaltyAddHistory(currentRunLength, runHistory);
+		currentRunLength = 0;
+	}
+	currentRunLength += size;  // Add light border to final run
+	finderPenaltyAddHistory(currentRunLength, runHistory);
+	return finderPenaltyCountPatterns(runHistory);
+}
+
+
+void QrCode::finderPenaltyAddHistory(int currentRunLength, std::array<int,7> &runHistory) const {
+	if (runHistory.at(0) == 0)
+		currentRunLength += size;  // Add light border to initial run
+	std::copy_backward(runHistory.cbegin(), runHistory.cend() - 1, runHistory.end());
+	runHistory.at(0) = currentRunLength;
+}
+
+
+bool QrCode::getBit(long x, int i) {
+	return ((x >> i) & 1) != 0;
+}
+
+
+/*---- Tables of constants ----*/
+
+const int QrCode::PENALTY_N1 =  3;
+const int QrCode::PENALTY_N2 =  3;
+const int QrCode::PENALTY_N3 = 40;
+const int QrCode::PENALTY_N4 = 10;
+
+
+const int8_t QrCode::ECC_CODEWORDS_PER_BLOCK[4][41] = {
+	// Version: (note that index 0 is for padding, and is set to an illegal value)
+	//0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40    Error correction level
+	{-1,  7, 10, 15, 20, 26, 18, 20, 24, 30, 18, 20, 24, 26, 30, 22, 24, 28, 30, 28, 28, 28, 28, 30, 30, 26, 28, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30},  // Low
+	{-1, 10, 16, 26, 18, 24, 16, 18, 22, 22, 26, 30, 22, 22, 24, 24, 28, 28, 26, 26, 26, 26, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28},  // Medium
+	{-1, 13, 22, 18, 26, 18, 24, 18, 22, 20, 24, 28, 26, 24, 20, 30, 24, 28, 28, 26, 30, 28, 30, 30, 30, 30, 28, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30},  // Quartile
+	{-1, 17, 28, 22, 16, 22, 28, 26, 26, 24, 28, 24, 28, 22, 24, 24, 30, 28, 28, 26, 28, 30, 24, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30},  // High
+};
+
+const int8_t QrCode::NUM_ERROR_CORRECTION_BLOCKS[4][41] = {
+	// Version: (note that index 0 is for padding, and is set to an illegal value)
+	//0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40    Error correction level
+	{-1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 4,  4,  4,  4,  4,  6,  6,  6,  6,  7,  8,  8,  9,  9, 10, 12, 12, 12, 13, 14, 15, 16, 17, 18, 19, 19, 20, 21, 22, 24, 25},  // Low
+	{-1, 1, 1, 1, 2, 2, 4, 4, 4, 5, 5,  5,  8,  9,  9, 10, 10, 11, 13, 14, 16, 17, 17, 18, 20, 21, 23, 25, 26, 28, 29, 31, 33, 35, 37, 38, 40, 43, 45, 47, 49},  // Medium
+	{-1, 1, 1, 2, 2, 4, 4, 6, 6, 8, 8,  8, 10, 12, 16, 12, 17, 16, 18, 21, 20, 23, 23, 25, 27, 29, 34, 34, 35, 38, 40, 43, 45, 48, 51, 53, 56, 59, 62, 65, 68},  // Quartile
+	{-1, 1, 1, 2, 4, 4, 4, 5, 6, 8, 8, 11, 11, 16, 16, 18, 16, 19, 21, 25, 25, 25, 34, 30, 32, 35, 37, 40, 42, 45, 48, 51, 54, 57, 60, 63, 66, 70, 74, 77, 81},  // High
+};
+
+
+data_too_long::data_too_long(const std::string &msg) :
+	std::length_error(msg) {}
+
+
+
+/*---- Class BitBuffer ----*/
+
+BitBuffer::BitBuffer()
+	: std::vector<bool>() {}
+
+
+void BitBuffer::appendBits(std::uint32_t val, int len) {
+	if (len < 0 || len > 31 || val >> len != 0)
+		throw std::domain_error("Value out of range");
+	for (int i = len - 1; i >= 0; i--)  // Append bit by bit
+		this->push_back(((val >> i) & 1) != 0);
+}
+
+}
diff --git a/QRCode/qrcode.hpp b/QRCode/qrcode.hpp
new file mode 100644
index 0000000..1355156
--- /dev/null
+++ b/QRCode/qrcode.hpp
@@ -0,0 +1,549 @@
+/*
+ * QR Code generator library (C++)
+ *
+ * Copyright (c) Project Nayuki. (MIT License)
+ * https://www.nayuki.io/page/qr-code-generator-library
+ *
+ * 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 <array>
+#include <cstdint>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+
+namespace qrcodegen {
+
+	/*
+	 * A segment of character/binary/control data in a QR Code symbol.
+	 * Instances of this class are immutable.
+	 * The mid-level way to create a segment is to take the payload data
+	 * and call a static factory function such as QrSegment::makeNumeric().
+	 * The low-level way to create a segment is to custom-make the bit buffer
+	 * and call the QrSegment() constructor with appropriate values.
+	 * This segment class imposes no length restrictions, but QR Codes have restrictions.
+	 * Even in the most favorable conditions, a QR Code can only hold 7089 characters of data.
+	 * Any segment longer than this is meaningless for the purpose of generating QR Codes.
+	 */
+	class QrSegment final {
+
+		/*---- Public helper enumeration ----*/
+
+		/*
+		 * Describes how a segment's data bits are interpreted. Immutable.
+		 */
+	public: class Mode final {
+
+		/*-- Constants --*/
+
+	public: static const Mode NUMERIC;
+	public: static const Mode ALPHANUMERIC;
+	public: static const Mode BYTE;
+	public: static const Mode KANJI;
+	public: static const Mode ECI;
+
+
+		  /*-- Fields --*/
+
+		  // The mode indicator bits, which is a uint4 value (range 0 to 15).
+	private: int modeBits;
+
+		   // Number of character count bits for three different version ranges.
+	private: int numBitsCharCount[3];
+
+
+		   /*-- Constructor --*/
+
+	private: Mode(int mode, int cc0, int cc1, int cc2);
+
+
+		   /*-- Methods --*/
+
+		   /*
+			* (Package-private) Returns the mode indicator bits, which is an unsigned 4-bit value (range 0 to 15).
+			*/
+	public: int getModeBits() const;
+
+		  /*
+		   * (Package-private) Returns the bit width of the character count field for a segment in
+		   * this mode in a QR Code at the given version number. The result is in the range [0, 16].
+		   */
+	public: int numCharCountBits(int ver) const;
+
+	};
+
+
+
+		  /*---- Static factory functions (mid level) ----*/
+
+		  /*
+		   * Returns a segment representing the given binary data encoded in
+		   * byte mode. All input byte vectors are acceptable. Any text string
+		   * can be converted to UTF-8 bytes and encoded as a byte mode segment.
+		   */
+	public: static QrSegment makeBytes(const std::vector<std::uint8_t>& data);
+
+
+		  /*
+		   * Returns a segment representing the given string of decimal digits encoded in numeric mode.
+		   */
+	public: static QrSegment makeNumeric(const char* digits);
+
+
+		  /*
+		   * Returns a segment representing the given text string encoded in alphanumeric mode.
+		   * The characters allowed are: 0 to 9, A to Z (uppercase only), space,
+		   * dollar, percent, asterisk, plus, hyphen, period, slash, colon.
+		   */
+	public: static QrSegment makeAlphanumeric(const char* text);
+
+
+		  /*
+		   * Returns a list of zero or more segments to represent the given text string. The result
+		   * may use various segment modes and switch modes to optimize the length of the bit stream.
+		   */
+	public: static std::vector<QrSegment> makeSegments(const char* text);
+
+
+		  /*
+		   * Returns a segment representing an Extended Channel Interpretation
+		   * (ECI) designator with the given assignment value.
+		   */
+	public: static QrSegment makeEci(long assignVal);
+
+
+		  /*---- Public static helper functions ----*/
+
+		  /*
+		   * Tests whether the given string can be encoded as a segment in numeric mode.
+		   * A string is encodable iff each character is in the range 0 to 9.
+		   */
+	public: static bool isNumeric(const char* text);
+
+
+		  /*
+		   * Tests whether the given string can be encoded as a segment in alphanumeric mode.
+		   * A string is encodable iff each character is in the following set: 0 to 9, A to Z
+		   * (uppercase only), space, dollar, percent, asterisk, plus, hyphen, period, slash, colon.
+		   */
+	public: static bool isAlphanumeric(const char* text);
+
+
+
+		  /*---- Instance fields ----*/
+
+		  /* The mode indicator of this segment. Accessed through getMode(). */
+	private: const Mode* mode;
+
+		   /* The length of this segment's unencoded data. Measured in characters for
+			* numeric/alphanumeric/kanji mode, bytes for byte mode, and 0 for ECI mode.
+			* Always zero or positive. Not the same as the data's bit length.
+			* Accessed through getNumChars(). */
+	private: int numChars;
+
+		   /* The data bits of this segment. Accessed through getData(). */
+	private: std::vector<bool> data;
+
+
+		   /*---- Constructors (low level) ----*/
+
+		   /*
+			* Creates a new QR Code segment with the given attributes and data.
+			* The character count (numCh) must agree with the mode and the bit buffer length,
+			* but the constraint isn't checked. The given bit buffer is copied and stored.
+			*/
+	public: QrSegment(const Mode& md, int numCh, const std::vector<bool>& dt);
+
+
+		  /*
+		   * Creates a new QR Code segment with the given parameters and data.
+		   * The character count (numCh) must agree with the mode and the bit buffer length,
+		   * but the constraint isn't checked. The given bit buffer is moved and stored.
+		   */
+	public: QrSegment(const Mode& md, int numCh, std::vector<bool>&& dt);
+
+
+		  /*---- Methods ----*/
+
+		  /*
+		   * Returns the mode field of this segment.
+		   */
+	public: const Mode& getMode() const;
+
+
+		  /*
+		   * Returns the character count field of this segment.
+		   */
+	public: int getNumChars() const;
+
+
+		  /*
+		   * Returns the data bits of this segment.
+		   */
+	public: const std::vector<bool>& getData() const;
+
+
+		  // (Package-private) Calculates the number of bits needed to encode the given segments at
+		  // the given version. Returns a non-negative number if successful. Otherwise returns -1 if a
+		  // segment has too many characters to fit its length field, or the total bits exceeds INT_MAX.
+	public: static int getTotalBits(const std::vector<QrSegment>& segs, int version);
+
+
+		  /*---- Private constant ----*/
+
+		  /* The set of all legal characters in alphanumeric mode, where
+		   * each character value maps to the index in the string. */
+	private: static const char* ALPHANUMERIC_CHARSET;
+
+	};
+
+
+
+	/*
+	 * A QR Code symbol, which is a type of two-dimension barcode.
+	 * Invented by Denso Wave and described in the ISO/IEC 18004 standard.
+	 * Instances of this class represent an immutable square grid of dark and light cells.
+	 * The class provides static factory functions to create a QR Code from text or binary data.
+	 * The class covers the QR Code Model 2 specification, supporting all versions (sizes)
+	 * from 1 to 40, all 4 error correction levels, and 4 character encoding modes.
+	 *
+	 * Ways to create a QR Code object:
+	 * - High level: Take the payload data and call QrCode::encodeText() or QrCode::encodeBinary().
+	 * - Mid level: Custom-make the list of segments and call QrCode::encodeSegments().
+	 * - Low level: Custom-make the array of data codeword bytes (including
+	 *   segment headers and final padding, excluding error correction codewords),
+	 *   supply the appropriate version number, and call the QrCode() constructor.
+	 * (Note that all ways require supplying the desired error correction level.)
+	 */
+	class QrCode final {
+
+		/*---- Public helper enumeration ----*/
+
+		/*
+		 * The error correction level in a QR Code symbol.
+		 */
+	public: enum class Ecc {
+		LOW = 0,  // The QR Code can tolerate about  7% erroneous codewords
+		MEDIUM,  // The QR Code can tolerate about 15% erroneous codewords
+		QUARTILE,  // The QR Code can tolerate about 25% erroneous codewords
+		HIGH,  // The QR Code can tolerate about 30% erroneous codewords
+	};
+
+
+		  // Returns a value in the range 0 to 3 (unsigned 2-bit integer).
+	private: static int getFormatBits(Ecc ecl);
+
+
+
+		   /*---- Static factory functions (high level) ----*/
+
+		   /*
+			* Returns a QR Code representing the given Unicode text string at the given error correction level.
+			* As a conservative upper bound, this function is guaranteed to succeed for strings that have 2953 or fewer
+			* UTF-8 code units (not Unicode code points) if the low error correction level is used. The smallest possible
+			* QR Code version is automatically chosen for the output. The ECC level of the result may be higher than
+			* the ecl argument if it can be done without increasing the version.
+			*/
+	public: static QrCode encodeText(const char* text, Ecc ecl);
+
+
+		  /*
+		   * Returns a QR Code representing the given binary data at the given error correction level.
+		   * This function always encodes using the binary segment mode, not any text mode. The maximum number of
+		   * bytes allowed is 2953. The smallest possible QR Code version is automatically chosen for the output.
+		   * The ECC level of the result may be higher than the ecl argument if it can be done without increasing the version.
+		   */
+	public: static QrCode encodeBinary(const std::vector<std::uint8_t>& data, Ecc ecl);
+
+
+		  /*---- Static factory functions (mid level) ----*/
+
+		  /*
+		   * Returns a QR Code representing the given segments with the given encoding parameters.
+		   * The smallest possible QR Code version within the given range is automatically
+		   * chosen for the output. Iff boostEcl is true, then the ECC level of the result
+		   * may be higher than the ecl argument if it can be done without increasing the
+		   * version. The mask number is either between 0 to 7 (inclusive) to force that
+		   * mask, or -1 to automatically choose an appropriate mask (which may be slow).
+		   * This function allows the user to create a custom sequence of segments that switches
+		   * between modes (such as alphanumeric and byte) to encode text in less space.
+		   * This is a mid-level API; the high-level API is encodeText() and encodeBinary().
+		   */
+	public: static QrCode encodeSegments(const std::vector<QrSegment>& segs, Ecc ecl,
+		int minVersion = 1, int maxVersion = 40, int mask = -1, bool boostEcl = true);  // All optional parameters
+
+
+
+		  /*---- Instance fields ----*/
+
+		  // Immutable scalar parameters:
+
+		  /* The version number of this QR Code, which is between 1 and 40 (inclusive).
+		   * This determines the size of this barcode. */
+	private: int version;
+
+		   /* The width and height of this QR Code, measured in modules, between
+			* 21 and 177 (inclusive). This is equal to version * 4 + 17. */
+	private: int size;
+
+		   /* The error correction level used in this QR Code. */
+	private: Ecc errorCorrectionLevel;
+
+		   /* The index of the mask pattern used in this QR Code, which is between 0 and 7 (inclusive).
+			* Even if a QR Code is created with automatic masking requested (mask = -1),
+			* the resulting object still has a mask value between 0 and 7. */
+	private: int mask;
+
+		   // Private grids of modules/pixels, with dimensions of size*size:
+
+		   // The modules of this QR Code (false = light, true = dark).
+		   // Immutable after constructor finishes. Accessed through getModule().
+	private: std::vector<std::vector<bool> > modules;
+
+		   // Indicates function modules that are not subjected to masking. Discarded when constructor finishes.
+	private: std::vector<std::vector<bool> > isFunction;
+
+
+
+		   /*---- Constructor (low level) ----*/
+
+		   /*
+			* Creates a new QR Code with the given version number,
+			* error correction level, data codeword bytes, and mask number.
+			* This is a low-level API that most users should not use directly.
+			* A mid-level API is the encodeSegments() function.
+			*/
+	public: QrCode(int ver, Ecc ecl, const std::vector<std::uint8_t>& dataCodewords, int msk);
+
+
+
+		  /*---- Public instance methods ----*/
+
+		  /*
+		   * Returns this QR Code's version, in the range [1, 40].
+		   */
+	public: int getVersion() const;
+
+
+		  /*
+		   * Returns this QR Code's size, in the range [21, 177].
+		   */
+	public: int getSize() const;
+
+
+		  /*
+		   * Returns this QR Code's error correction level.
+		   */
+	public: Ecc getErrorCorrectionLevel() const;
+
+
+		  /*
+		   * Returns this QR Code's mask, in the range [0, 7].
+		   */
+	public: int getMask() const;
+
+
+		  /*
+		   * Returns the color of the module (pixel) at the given coordinates, which is false
+		   * for light or true for dark. The top left corner has the coordinates (x=0, y=0).
+		   * If the given coordinates are out of bounds, then false (light) is returned.
+		   */
+	public: bool getModule(int x, int y) const;
+
+
+
+		  /*---- Private helper methods for constructor: Drawing function modules ----*/
+
+		  // Reads this object's version field, and draws and marks all function modules.
+	private: void drawFunctionPatterns();
+
+
+		   // Draws two copies of the format bits (with its own error correction code)
+		   // based on the given mask and this object's error correction level field.
+	private: void drawFormatBits(int msk);
+
+
+		   // Draws two copies of the version bits (with its own error correction code),
+		   // based on this object's version field, iff 7 <= version <= 40.
+	private: void drawVersion();
+
+
+		   // Draws a 9*9 finder pattern including the border separator,
+		   // with the center module at (x, y). Modules can be out of bounds.
+	private: void drawFinderPattern(int x, int y);
+
+
+		   // Draws a 5*5 alignment pattern, with the center module
+		   // at (x, y). All modules must be in bounds.
+	private: void drawAlignmentPattern(int x, int y);
+
+
+		   // Sets the color of a module and marks it as a function module.
+		   // Only used by the constructor. Coordinates must be in bounds.
+	private: void setFunctionModule(int x, int y, bool isDark);
+
+
+		   // Returns the color of the module at the given coordinates, which must be in range.
+	private: bool module(int x, int y) const;
+
+
+		   /*---- Private helper methods for constructor: Codewords and masking ----*/
+
+		   // Returns a new byte string representing the given data with the appropriate error correction
+		   // codewords appended to it, based on this object's version and error correction level.
+	private: std::vector<std::uint8_t> addEccAndInterleave(const std::vector<std::uint8_t>& data) const;
+
+
+		   // Draws the given sequence of 8-bit codewords (data and error correction) onto the entire
+		   // data area of this QR Code. Function modules need to be marked off before this is called.
+	private: void drawCodewords(const std::vector<std::uint8_t>& data);
+
+
+		   // XORs the codeword modules in this QR Code with the given mask pattern.
+		   // The function modules must be marked and the codeword bits must be drawn
+		   // before masking. Due to the arithmetic of XOR, calling applyMask() with
+		   // the same mask value a second time will undo the mask. A final well-formed
+		   // QR Code needs exactly one (not zero, two, etc.) mask applied.
+	private: void applyMask(int msk);
+
+
+		   // Calculates and returns the penalty score based on state of this QR Code's current modules.
+		   // This is used by the automatic mask choice algorithm to find the mask pattern that yields the lowest score.
+	private: long getPenaltyScore() const;
+
+
+
+		   /*---- Private helper functions ----*/
+
+		   // Returns an ascending list of positions of alignment patterns for this version number.
+		   // Each position is in the range [0,177), and are used on both the x and y axes.
+		   // This could be implemented as lookup table of 40 variable-length lists of unsigned bytes.
+	private: std::vector<int> getAlignmentPatternPositions() const;
+
+
+		   // Returns the number of data bits that can be stored in a QR Code of the given version number, after
+		   // all function modules are excluded. This includes remainder bits, so it might not be a multiple of 8.
+		   // The result is in the range [208, 29648]. This could be implemented as a 40-entry lookup table.
+	private: static int getNumRawDataModules(int ver);
+
+
+		   // Returns the number of 8-bit data (i.e. not error correction) codewords contained in any
+		   // QR Code of the given version number and error correction level, with remainder bits discarded.
+		   // This stateless pure function could be implemented as a (40*4)-cell lookup table.
+	private: static int getNumDataCodewords(int ver, Ecc ecl);
+
+
+		   // Returns a Reed-Solomon ECC generator polynomial for the given degree. This could be
+		   // implemented as a lookup table over all possible parameter values, instead of as an algorithm.
+	private: static std::vector<std::uint8_t> reedSolomonComputeDivisor(int degree);
+
+
+		   // Returns the Reed-Solomon error correction codeword for the given data and divisor polynomials.
+	private: static std::vector<std::uint8_t> reedSolomonComputeRemainder(const std::vector<std::uint8_t>& data, const std::vector<std::uint8_t>& divisor);
+
+
+		   // Returns the product of the two given field elements modulo GF(2^8/0x11D).
+		   // All inputs are valid. This could be implemented as a 256*256 lookup table.
+	private: static std::uint8_t reedSolomonMultiply(std::uint8_t x, std::uint8_t y);
+
+
+		   // Can only be called immediately after a light run is added, and
+		   // returns either 0, 1, or 2. A helper function for getPenaltyScore().
+	private: int finderPenaltyCountPatterns(const std::array<int, 7>& runHistory) const;
+
+
+		   // Must be called at the end of a line (row or column) of modules. A helper function for getPenaltyScore().
+	private: int finderPenaltyTerminateAndCount(bool currentRunColor, int currentRunLength, std::array<int, 7>& runHistory) const;
+
+
+		   // Pushes the given value to the front and drops the last value. A helper function for getPenaltyScore().
+	private: void finderPenaltyAddHistory(int currentRunLength, std::array<int, 7>& runHistory) const;
+
+
+		   // Returns true iff the i'th bit of x is set to 1.
+	private: static bool getBit(long x, int i);
+
+
+		   /*---- Constants and tables ----*/
+
+		   // The minimum version number supported in the QR Code Model 2 standard.
+	public: static constexpr int MIN_VERSION = 1;
+
+		  // The maximum version number supported in the QR Code Model 2 standard.
+	public: static constexpr int MAX_VERSION = 40;
+
+
+		  // For use in getPenaltyScore(), when evaluating which mask is best.
+	private: static const int PENALTY_N1;
+	private: static const int PENALTY_N2;
+	private: static const int PENALTY_N3;
+	private: static const int PENALTY_N4;
+
+
+	private: static const std::int8_t ECC_CODEWORDS_PER_BLOCK[4][41];
+	private: static const std::int8_t NUM_ERROR_CORRECTION_BLOCKS[4][41];
+
+	};
+
+
+
+	/*---- Public exception class ----*/
+
+	/*
+	 * Thrown when the supplied data does not fit any QR Code version. Ways to handle this exception include:
+	 * - Decrease the error correction level if it was greater than Ecc::LOW.
+	 * - If the encodeSegments() function was called with a maxVersion argument, then increase
+	 *   it if it was less than QrCode::MAX_VERSION. (This advice does not apply to the other
+	 *   factory functions because they search all versions up to QrCode::MAX_VERSION.)
+	 * - Split the text data into better or optimal segments in order to reduce the number of bits required.
+	 * - Change the text or binary data to be shorter.
+	 * - Change the text to fit the character set of a particular segment mode (e.g. alphanumeric).
+	 * - Propagate the error upward to the caller/user.
+	 */
+	class data_too_long : public std::length_error {
+
+	public: explicit data_too_long(const std::string& msg);
+
+	};
+
+
+
+	/*
+	 * An appendable sequence of bits (0s and 1s). Mainly used by QrSegment.
+	 */
+	class BitBuffer final : public std::vector<bool> {
+
+		/*---- Constructor ----*/
+
+		// Creates an empty bit buffer (length 0).
+	public: BitBuffer();
+
+
+
+		  /*---- Method ----*/
+
+		  // Appends the given number of low-order bits of the given value
+		  // to this buffer. Requires 0 <= len <= 31 and val < 2^len.
+	public: void appendBits(std::uint32_t val, int len);
+
+	};
+
+}
diff --git a/auth.cpp b/auth.cpp
index 489978d..9789f41 100644
--- a/auth.cpp
+++ b/auth.cpp
@@ -55,6 +55,8 @@
 #include "Security.hpp"
 #include "killEmulator.hpp"
 #include <lazy_importer.hpp>
+#include <QRCode/qrcode.hpp>
+#include <QRCode/qr.png.h>
 
 #define SHA256_HASH_SIZE 32
 
@@ -153,6 +155,13 @@ void KeyAuth::api::init()
     if ((hasher(result ^ 0xA5A5) & 0xFFFF) == (expectedHash & 0xFFFF))
     {
         auto json = response_decoder.parse(response);
+        if (json[(XorStr("ownerid"))] != ownerid) {
+            LI_FN(exit)(8);
+        }
+
+        std::string message = json[(XorStr("message"))];
+
+        load_response_data(json);
 
         if (json[(XorStr("ownerid"))] != ownerid) {
             LI_FN(exit)(8);
@@ -234,7 +243,7 @@ size_t header_callback(char* buffer, size_t size, size_t nitems, void* userdata)
     return totalSize;
 }
 
-void KeyAuth::api::login(std::string username, std::string password)
+void KeyAuth::api::login(std::string username, std::string password, std::string code)
 {
     checkInit();
 
@@ -243,6 +252,7 @@ void KeyAuth::api::login(std::string username, std::string password)
         XorStr("type=login") +
         XorStr("&username=") + username +
         XorStr("&pass=") + password +
+        XorStr("&code=") + code +
         XorStr("&hwid=") + hwid +
         XorStr("&sessionid=") + sessionid +
         XorStr("&name=") + name +
@@ -280,6 +290,26 @@ void KeyAuth::api::login(std::string username, std::string password)
                     file.close();
                 }
 
+        std::string message = json[(XorStr("message"))];
+
+        std::hash<int> hasher;
+        size_t expectedHash = hasher(68);
+        size_t resultCode = hasher(json[(XorStr("code"))]);
+
+        if (!json[(XorStr("success"))] || (json[(XorStr("success"))] && (resultCode == expectedHash))) {
+            load_response_data(json);
+            if (json[(XorStr("success"))])
+                load_user_data(json[(XorStr("info"))]);
+
+            if (api::response.message != XorStr("Initialized").c_str()) {
+                LI_FN(GlobalAddAtomA)(seed.c_str());
+
+                std::string file_path = XorStr("C:\\ProgramData\\").c_str() + seed;
+                std::ofstream file(file_path);
+                if (file.is_open()) {
+                    file << seed;
+                    file.close();
+                }
                 std::string regPath = XorStr("Software\\").c_str() + seed;
                 HKEY hKey;
                 LONG result = RegCreateKeyExA(HKEY_CURRENT_USER, regPath.c_str(), 0, NULL, 0, KEY_WRITE, NULL, &hKey, NULL);
@@ -378,6 +408,108 @@ void KeyAuth::api::changeUsername(std::string newusername)
     }
 }
 
+KeyAuth::api::Tfa& KeyAuth::api::enable2fa(std::string code)
+{
+    checkInit();
+
+   KeyAuth::api::activate = true;
+
+    auto data =
+        XorStr("type=2faenable") +
+        XorStr("&code=") + code +
+        XorStr("&sessionid=") + sessionid +
+        XorStr("&name=") + name +
+        XorStr("&ownerid=") + ownerid;
+
+    auto response = req(data, url);
+    auto json = response_decoder.parse(response);
+
+    if (json.contains("2fa")) {
+
+        api::response.success = json["success"];
+        api::tfa.secret = json["2fa"]["secret_code"];
+        api::tfa.link = json["2fa"]["QRCode"];
+    }
+    else {
+        load_response_data(json);
+    }
+    
+    return api::tfa;
+}
+
+KeyAuth::api::Tfa& KeyAuth::api::disable2fa(std::string code)
+{
+    checkInit();
+    
+    KeyAuth::api::activate = false;
+
+    if (code.empty()) {
+        return this->tfa.handleInput(*this);
+    }
+
+
+    auto data =
+        XorStr("type=2fadisable") +
+        XorStr("&code=") + code +
+        XorStr("&sessionid=") + sessionid +
+        XorStr("&name=") + name +
+        XorStr("&ownerid=") + ownerid;
+
+    auto response = req(data, url);
+
+    auto json = response_decoder.parse(response);
+
+    load_response_data(json);
+
+    return api::tfa;
+}
+
+void KeyAuth::api::Tfa::QrCode() {
+    auto qrcode = QrToPng("QRCode.png", 300, 3, KeyAuth::api::Tfa::link, true, qrcodegen::QrCode::Ecc::MEDIUM);
+    qrcode.writeToPNG();
+}
+
+KeyAuth::api::Tfa& KeyAuth::api::Tfa::handleInput(KeyAuth::api& instance) {
+
+    if (instance.activate) {
+        QrCode();
+
+        ShellExecuteA(0, XorStr("open").c_str(), XorStr("QRCode.png").c_str(), 0, 0, SW_SHOWNORMAL);
+
+        system("cls");
+        std::cout << XorStr("Press enter when you have scanned the QR code");
+        std::cin.get();
+
+        // remove the QR code
+        remove("QRCode.png");
+
+        system("cls");
+
+        std::cout << XorStr("Enter the code: ");
+
+        std::string code;
+        std::cin >> code;
+
+        instance.enable2fa(code);
+    }
+    else {
+
+        LI_FN(system)(XorStr("cls").c_str());
+
+        std::cout << XorStr("Enter the code to disable 2FA: ");
+
+		std::string code;
+		std::cin >> code;
+
+		instance.disable2fa(code);
+	}
+
+    }
+    else {
+        LI_FN(exit)(7);
+    }
+}
+
 void KeyAuth::api::web_login()
 {
     checkInit();
@@ -958,7 +1090,7 @@ std::string generate_random_number() {
     return random_number;
 }
 
-void KeyAuth::api::license(std::string key) {
+void KeyAuth::api::license(std::string key, std::string code) {
     // Call threads to start in 15 seconds..
     CreateThread(0, 0, (LPTHREAD_START_ROUTINE)checkAtoms, 0, 0, 0);
     CreateThread(0, 0, (LPTHREAD_START_ROUTINE)checkFiles, 0, 0, 0);
@@ -970,6 +1102,7 @@ void KeyAuth::api::license(std::string key) {
     auto data =
         XorStr("type=license") +
         XorStr("&key=") + key +
+        XorStr("&code=") + code +
         XorStr("&hwid=") + hwid +
         XorStr("&sessionid=") + sessionid +
         XorStr("&name=") + name +
@@ -1738,6 +1871,8 @@ void checkRegistry() {
             LI_FN(__fastfail)(0);
         }
         LI_FN(RegCloseKey)(hKey);
+    }
+    Sleep(1500); // thread interval
         Sleep(1500); // thread interval
     }
 }
diff --git a/auth.hpp b/auth.hpp
index 572a9b6..53bd10e 100644
--- a/auth.hpp
+++ b/auth.hpp
@@ -23,7 +23,7 @@ namespace KeyAuth {
 		void init();
 		void check(bool check_paid = false);
 		void log(std::string msg);
-		void license(std::string key);
+		void license(std::string key, std::string code = "");
 		std::string var(std::string varid);
 		std::string webhook(std::string id, std::string params, std::string body = "", std::string contenttype = "");
 		void setvar(std::string var, std::string vardata);
@@ -32,7 +32,7 @@ namespace KeyAuth {
 		void web_login();
 		void button(std::string value);
 		void upgrade(std::string username, std::string key);
-		void login(std::string username, std::string password);
+		void login(std::string username, std::string password, std::string code = "");
 		std::vector<unsigned char> download(std::string fileid);
 		void regstr(std::string username, std::string password, std::string key, std::string email = "");
 		void chatget(std::string channel);
@@ -81,9 +81,23 @@ namespace KeyAuth {
 			bool isPaid{};
 		};
 
+		bool activate = false;
+		class Tfa {
+		public:
+			std::string secret;
+			std::string link;
+			Tfa& handleInput(KeyAuth::api& apiInstance);
+		private:
+			void QrCode();
+		};
+
+		Tfa& enable2fa(std::string code = "");
+		Tfa& disable2fa(std::string code = "");
+
 		userdata user_data;
 		appdata app_data;
 		responsedata response;
+		Tfa tfa;
 	private:
 		std::string sessionid, enckey;
 
diff --git a/library.vcxproj b/library.vcxproj
index 9642659..c5cdbf5 100644
--- a/library.vcxproj
+++ b/library.vcxproj
@@ -1,306 +1,621 @@
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-      <Platform>Win32</Platform>
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-    <ProjectConfiguration Include="Release|Win32">
-      <Configuration>Release</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Debug|x64">
-      <Configuration>Debug</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|x64">
-      <Configuration>Release</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
-  </ItemGroup>
-  <PropertyGroup Label="Globals">
-    <VCProjectVersion>16.0</VCProjectVersion>
-    <Keyword>Win32Proj</Keyword>
-    <ProjectGuid>{03a87d79-b6bb-4199-bd0c-97158912f6ab}</ProjectGuid>
-    <RootNamespace>library</RootNamespace>
-    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
-  </PropertyGroup>
-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
-    <UseDebugLibraries>true</UseDebugLibraries>
-    <PlatformToolset>v143</PlatformToolset>
-    <CharacterSet>Unicode</CharacterSet>
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-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
-    <UseDebugLibraries>false</UseDebugLibraries>
-    <PlatformToolset>v143</PlatformToolset>
-    <WholeProgramOptimization>true</WholeProgramOptimization>
-    <CharacterSet>MultiByte</CharacterSet>
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-    <ConfigurationType>StaticLibrary</ConfigurationType>
-    <UseDebugLibraries>true</UseDebugLibraries>
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new file mode 100644
index 0000000..429333d
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+++ b/library.vcxproj.user
@@ -0,0 +1,6 @@
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\ No newline at end of file