feat: Support for QR codes.

pom.xml

@@ -149,6 +149,21 @@
 			<artifactId>base58</artifactId>
 			<version>0.0.2</version>
 		</dependency>
+		<dependency>
+			<groupId>com.google.zxing</groupId>
+			<artifactId>core</artifactId>
+			<version>3.4.1</version>
+		</dependency>
+		<dependency>
+			<groupId>com.google.zxing</groupId>
+			<artifactId>javase</artifactId>
+			<version>3.4.1</version>
+		</dependency>
+		<dependency>
+			<groupId>commons-codec</groupId>
+			<artifactId>commons-codec</artifactId>
+			<version>1.15</version>
+		</dependency>
 	</dependencies>
 
 </project>

src/main/java/com/danubetech/cborld/qrcode/CborLdQrCode.java

@@ -0,0 +1,55 @@
+package com.danubetech.cborld.qrcode;
+
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.WriterException;
+import com.google.zxing.client.j2se.MatrixToImageWriter;
+import com.google.zxing.common.BitMatrix;
+import com.google.zxing.qrcode.QRCodeWriter;
+import org.apache.commons.codec.binary.Base32;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+public class CborLdQrCode {
+    public static final String FORMAT_PNG = "png";
+    public static final String FORMAT_JPG = "jpg";
+
+    public static final String DEFAULT_FORMAT = FORMAT_PNG;
+    public static final int DEFAULT_WIDTH = 800;
+    public static final int DEFAULT_HEIGHT = 400;
+
+    public static byte[] toQrCode(byte[] bytes, String format, int width, int height) throws WriterException, IOException {
+        String base32String = new Base32().encodeAsString(bytes);
+        System.out.println(base32String);
+
+        QRCodeWriter qrCodeWriter = new QRCodeWriter();
+        BitMatrix bitMatrix = qrCodeWriter.encode(base32String, BarcodeFormat.QR_CODE, width, height);
+
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        BufferedImage bufferedImage = MatrixToImageWriter.toBufferedImage(bitMatrix);
+        ImageIO.write(bufferedImage, format, out);
+        return out.toByteArray();
+    }
+
+    public static byte[] toQrCode(byte[] bytes, String format, int width) throws WriterException, IOException {
+        return toQrCode(bytes, format, width, width);
+    }
+
+    public static byte[] toQrCode(byte[] bytes, String format) throws WriterException, IOException {
+        return toQrCode(bytes, format, DEFAULT_WIDTH, DEFAULT_HEIGHT);
+    }
+
+    public static byte[] toQrCode(byte[] bytes, int width, int height) throws WriterException, IOException {
+        return toQrCode(bytes, DEFAULT_FORMAT, width, height);
+    }
+
+    public static byte[] toQrCode(byte[] bytes, int width) throws WriterException, IOException {
+        return toQrCode(bytes, DEFAULT_FORMAT, width, width);
+    }
+
+    public static byte[] toQrCode(byte[] bytes) throws WriterException, IOException {
+        return toQrCode(bytes, DEFAULT_FORMAT, DEFAULT_WIDTH, DEFAULT_HEIGHT);
+    }
+}