:octocat: +QRDataModeInterface::getParity()

src/Data/ECI.php

@@ -44,6 +44,11 @@ final class ECI extends QRDataModeAbstract{
 		$this->encoding = $encoding;
 	}
 
+	public function getParity():int{
+		throw new QRCodeDataException('not implemented');
+	}
+
+
 	public function getLengthInBits():int{
 
 		if($this->encoding < 128){

src/Data/QRData.php

@@ -206,6 +206,21 @@ final class QRData{
 		throw new QRCodeDataException('failed to guess minimum version'); // @codeCoverageIgnore
 	}
 
+	public function getPariity():int{
+		$parity = 0;
+
+		foreach($this->dataSegments as $segment){
+
+			if($segment instanceof ECI){
+				continue;
+			}
+
+			$parity ^= $segment->getParity();
+		}
+
+		return $parity;
+	}
+
 	/**
 	 * creates a BitBuffer and writes the string data to it
 	 *

src/Data/QRDataModeAbstract.php

@@ -12,6 +12,7 @@ declare(strict_types=1);
 namespace chillerlan\QRCode\Data;
 
 use chillerlan\QRCode\Common\Mode;
+use function str_split;
 
 /**
  * abstract methods for the several data modes
@@ -45,6 +46,16 @@ abstract class QRDataModeAbstract implements QRDataModeInterface{
 		return strlen($this->data);
 	}
 
+	public function getParity():int{
+		$parity = 0;
+
+		foreach(str_split($this->data) as $chr){
+			$parity ^= ord($chr);
+		}
+
+		return $parity;
+	}
+
 	public static function convertEncoding(string $string):string{
 		return $string;
 	}

src/Data/QRDataModeInterface.php

@@ -33,6 +33,8 @@ interface QRDataModeInterface{
 	 */
 	public function getLengthInBits():int;
 
+	public function getParity():int;
+
 	/**
 	 * encoding conversion helper
 	 *

tests/Data/QRDataTest.php

@@ -15,6 +15,8 @@ use chillerlan\QRCode\Common\BitBuffer;
 use chillerlan\QRCode\Common\EccLevel;
 use chillerlan\QRCode\Common\MaskPattern;
 use chillerlan\QRCode\Data\Byte;
+use chillerlan\QRCode\Data\Kanji;
+use chillerlan\QRCode\Data\Number;
 use chillerlan\QRCode\Data\QRData;
 use chillerlan\QRCode\Output\QRGdImagePNG;
 use chillerlan\QRCode\QRCode;
@@ -88,4 +90,11 @@ final class QRDataTest extends TestCase{
 		$this::assertSame(11, $qrData->getMinimumVersion()->getVersionNumber()); // version adjusted to 11
 	}
 
+	public function testGetParity():void{
+		$qrData = new QRData(new QROptions, [new Number('0123'), new Number('4567'), new Number('89'), new Kanji('日本')]);
+
+		// ISO/IEC 18004:2000 - 9.3 Parity Data
+		$this::assertSame(133, $qrData->getPariity()); // 85 hex
+	}
+
 }