1  /* 
  2   * QR Code generator demo (C++)
  3   * 
  4   * Run this command-line program with no arguments. The program computes a bunch of demonstration
  5   * QR Codes and prints them to the console. Also, the SVG code for one QR Code is printed as a sample.
  6   * 
  7   * Copyright (c) Project Nayuki. (MIT License)
  8   * https://www.nayuki.io/page/qr-code-generator-library
  9   * 
 10   * Permission is hereby granted, free of charge, to any person obtaining a copy of
 11   * this software and associated documentation files (the "Software"), to deal in
 12   * the Software without restriction, including without limitation the rights to
 13   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 14   * the Software, and to permit persons to whom the Software is furnished to do so,
 15   * subject to the following conditions:
 16   * - The above copyright notice and this permission notice shall be included in
 17   *   all copies or substantial portions of the Software.
 18   * - The Software is provided "as is", without warranty of any kind, express or
 19   *   implied, including but not limited to the warranties of merchantability,
 20   *   fitness for a particular purpose and noninfringement. In no event shall the
 21   *   authors or copyright holders be liable for any claim, damages or other
 22   *   liability, whether in an action of contract, tort or otherwise, arising from,
 23   *   out of or in connection with the Software or the use or other dealings in the
 24   *   Software.
 25   */
 26  
 27  #include <cstdint>
 28  #include <cstdlib>
 29  #include <cstring>
 30  #include <iostream>
 31  #include <string>
 32  #include <vector>
 33  #include "QrCode.hpp"
 34  
 35  using std::uint8_t;
 36  using qrcodegen::QrCode;
 37  using qrcodegen::QrSegment;
 38  
 39  
 40  // Function prototypes
 41  static void doBasicDemo();
 42  static void doVarietyDemo();
 43  static void doSegmentDemo();
 44  static void doMaskDemo();
 45  static void printQr(const QrCode &qr);
 46  
 47  
 48  // The main application program.
 49  int main() {
 50  	doBasicDemo();
 51  	doVarietyDemo();
 52  	doSegmentDemo();
 53  	doMaskDemo();
 54  	return EXIT_SUCCESS;
 55  }
 56  
 57  
 58  
 59  /*---- Demo suite ----*/
 60  
 61  // Creates a single QR Code, then prints it to the console.
 62  static void doBasicDemo() {
 63  	const char *text = "Hello, world!";              // User-supplied text
 64  	const QrCode::Ecc errCorLvl = QrCode::Ecc::LOW;  // Error correction level
 65  	
 66  	// Make and print the QR Code symbol
 67  	const QrCode qr = QrCode::encodeText(text, errCorLvl);
 68  	printQr(qr);
 69  	std::cout << qr.toSvgString(4) << std::endl;
 70  }
 71  
 72  
 73  // Creates a variety of QR Codes that exercise different features of the library, and prints each one to the console.
 74  static void doVarietyDemo() {
 75  	// Numeric mode encoding (3.33 bits per digit)
 76  	const QrCode qr0 = QrCode::encodeText("314159265358979323846264338327950288419716939937510", QrCode::Ecc::MEDIUM);
 77  	printQr(qr0);
 78  	
 79  	// Alphanumeric mode encoding (5.5 bits per character)
 80  	const QrCode qr1 = QrCode::encodeText("DOLLAR-AMOUNT:$39.87 PERCENTAGE:100.00% OPERATIONS:+-*/", QrCode::Ecc::HIGH);
 81  	printQr(qr1);
 82  	
 83  	// Unicode text as UTF-8
 84  	const QrCode qr2 = QrCode::encodeText("\xE3\x81\x93\xE3\x82\x93\xE3\x81\xAB\xE3\x81\xA1wa\xE3\x80\x81"
 85  		"\xE4\xB8\x96\xE7\x95\x8C\xEF\xBC\x81\x20\xCE\xB1\xCE\xB2\xCE\xB3\xCE\xB4", QrCode::Ecc::QUARTILE);
 86  	printQr(qr2);
 87  	
 88  	// Moderately large QR Code using longer text (from Lewis Carroll's Alice in Wonderland)
 89  	const QrCode qr3 = QrCode::encodeText(
 90  		"Alice was beginning to get very tired of sitting by her sister on the bank, "
 91  		"and of having nothing to do: once or twice she had peeped into the book her sister was reading, "
 92  		"but it had no pictures or conversations in it, 'and what is the use of a book,' thought Alice "
 93  		"'without pictures or conversations?' So she was considering in her own mind (as well as she could, "
 94  		"for the hot day made her feel very sleepy and stupid), whether the pleasure of making a "
 95  		"daisy-chain would be worth the trouble of getting up and picking the daisies, when suddenly "
 96  		"a White Rabbit with pink eyes ran close by her.", QrCode::Ecc::HIGH);
 97  	printQr(qr3);
 98  }
 99  
100  
101  // Creates QR Codes with manually specified segments for better compactness.
102  static void doSegmentDemo() {
103  	// Illustration "silver"
104  	const char *silver0 = "THE SQUARE ROOT OF 2 IS 1.";
105  	const char *silver1 = "41421356237309504880168872420969807856967187537694807317667973799";
106  	const QrCode qr0 = QrCode::encodeText(
107  		(std::string(silver0) + silver1).c_str(),
108  		QrCode::Ecc::LOW);
109  	printQr(qr0);
110  	
111  	const QrCode qr1 = QrCode::encodeSegments(
112  		{QrSegment::makeAlphanumeric(silver0), QrSegment::makeNumeric(silver1)},
113  		QrCode::Ecc::LOW);
114  	printQr(qr1);
115  	
116  	// Illustration "golden"
117  	const char *golden0 = "Golden ratio \xCF\x86 = 1.";
118  	const char *golden1 = "6180339887498948482045868343656381177203091798057628621354486227052604628189024497072072041893911374";
119  	const char *golden2 = "......";
120  	const QrCode qr2 = QrCode::encodeText(
121  		(std::string(golden0) + golden1 + golden2).c_str(),
122  		QrCode::Ecc::LOW);
123  	printQr(qr2);
124  	
125  	std::vector<uint8_t> bytes(golden0, golden0 + std::strlen(golden0));
126  	const QrCode qr3 = QrCode::encodeSegments(
127  		{QrSegment::makeBytes(bytes), QrSegment::makeNumeric(golden1), QrSegment::makeAlphanumeric(golden2)},
128  		QrCode::Ecc::LOW);
129  	printQr(qr3);
130  	
131  	// Illustration "Madoka": kanji, kana, Cyrillic, full-width Latin, Greek characters
132  	const char *madoka =  // Encoded in UTF-8
133  		"\xE3\x80\x8C\xE9\xAD\x94\xE6\xB3\x95\xE5"
134  		"\xB0\x91\xE5\xA5\xB3\xE3\x81\xBE\xE3\x81"
135  		"\xA9\xE3\x81\x8B\xE2\x98\x86\xE3\x83\x9E"
136  		"\xE3\x82\xAE\xE3\x82\xAB\xE3\x80\x8D\xE3"
137  		"\x81\xA3\xE3\x81\xA6\xE3\x80\x81\xE3\x80"
138  		"\x80\xD0\x98\xD0\x90\xD0\x98\xE3\x80\x80"
139  		"\xEF\xBD\x84\xEF\xBD\x85\xEF\xBD\x93\xEF"
140  		"\xBD\x95\xE3\x80\x80\xCE\xBA\xCE\xB1\xEF"
141  		"\xBC\x9F";
142  	const QrCode qr4 = QrCode::encodeText(madoka, QrCode::Ecc::LOW);
143  	printQr(qr4);
144  	
145  	const std::vector<int> kanjiChars{  // Kanji mode encoding (13 bits per character)
146  		0x0035, 0x1002, 0x0FC0, 0x0AED, 0x0AD7,
147  		0x015C, 0x0147, 0x0129, 0x0059, 0x01BD,
148  		0x018D, 0x018A, 0x0036, 0x0141, 0x0144,
149  		0x0001, 0x0000, 0x0249, 0x0240, 0x0249,
150  		0x0000, 0x0104, 0x0105, 0x0113, 0x0115,
151  		0x0000, 0x0208, 0x01FF, 0x0008,
152  	};
153  	qrcodegen::BitBuffer bb;
154  	for (int c : kanjiChars)
155  		bb.appendBits(static_cast<std::uint32_t>(c), 13);
156  	const QrCode qr5 = QrCode::encodeSegments(
157  		{QrSegment(QrSegment::Mode::KANJI, static_cast<int>(kanjiChars.size()), bb)},
158  		QrCode::Ecc::LOW);
159  	printQr(qr5);
160  }
161  
162  
163  // Creates QR Codes with the same size and contents but different mask patterns.
164  static void doMaskDemo() {
165  	// Project Nayuki URL
166  	std::vector<QrSegment> segs0 = QrSegment::makeSegments("https://www.nayuki.io/");
167  	printQr(QrCode::encodeSegments(segs0, QrCode::Ecc::HIGH, QrCode::MIN_VERSION, QrCode::MAX_VERSION, -1, true));  // Automatic mask
168  	printQr(QrCode::encodeSegments(segs0, QrCode::Ecc::HIGH, QrCode::MIN_VERSION, QrCode::MAX_VERSION, 3, true));  // Force mask 3
169  	
170  	// Chinese text as UTF-8
171  	std::vector<QrSegment> segs1 = QrSegment::makeSegments(
172  		"\xE7\xB6\xAD\xE5\x9F\xBA\xE7\x99\xBE\xE7\xA7\x91\xEF\xBC\x88\x57\x69\x6B\x69\x70"
173  		"\x65\x64\x69\x61\xEF\xBC\x8C\xE8\x81\x86\xE8\x81\xBD\x69\x2F\xCB\x8C\x77\xC9\xAA"
174  		"\x6B\xE1\xB5\xBB\xCB\x88\x70\x69\xCB\x90\x64\x69\x2E\xC9\x99\x2F\xEF\xBC\x89\xE6"
175  		"\x98\xAF\xE4\xB8\x80\xE5\x80\x8B\xE8\x87\xAA\xE7\x94\xB1\xE5\x85\xA7\xE5\xAE\xB9"
176  		"\xE3\x80\x81\xE5\x85\xAC\xE9\x96\x8B\xE7\xB7\xA8\xE8\xBC\xAF\xE4\xB8\x94\xE5\xA4"
177  		"\x9A\xE8\xAA\x9E\xE8\xA8\x80\xE7\x9A\x84\xE7\xB6\xB2\xE8\xB7\xAF\xE7\x99\xBE\xE7"
178  		"\xA7\x91\xE5\x85\xA8\xE6\x9B\xB8\xE5\x8D\x94\xE4\xBD\x9C\xE8\xA8\x88\xE7\x95\xAB");
179  	printQr(QrCode::encodeSegments(segs1, QrCode::Ecc::MEDIUM, QrCode::MIN_VERSION, QrCode::MAX_VERSION, 0, true));  // Force mask 0
180  	printQr(QrCode::encodeSegments(segs1, QrCode::Ecc::MEDIUM, QrCode::MIN_VERSION, QrCode::MAX_VERSION, 1, true));  // Force mask 1
181  	printQr(QrCode::encodeSegments(segs1, QrCode::Ecc::MEDIUM, QrCode::MIN_VERSION, QrCode::MAX_VERSION, 5, true));  // Force mask 5
182  	printQr(QrCode::encodeSegments(segs1, QrCode::Ecc::MEDIUM, QrCode::MIN_VERSION, QrCode::MAX_VERSION, 7, true));  // Force mask 7
183  }
184  
185  
186  
187  /*---- Utilities ----*/
188  
189  // Prints the given QrCode object to the console.
190  static void printQr(const QrCode &qr) {
191  	int border = 4;
192  	for (int y = -border; y < qr.getSize() + border; y++) {
193  		for (int x = -border; x < qr.getSize() + border; x++) {
194  			std::cout << (qr.getModule(x, y) ? "##" : "  ");
195  		}
196  		std::cout << std::endl;
197  	}
198  	std::cout << std::endl;
199  }