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<?php
namespace Zxing;
use Exception;
use Zxing\Common\HybridBinarizer;
use Zxing\Qrcode\QRCodeReader;
final class QrReader
{
/**
* @var string
*/
public const SOURCE_TYPE_FILE = 'file';
/**
* @var string
*/
public const SOURCE_TYPE_BLOB = 'blob';
/**
* @var string
*/
public const SOURCE_TYPE_RESOURCE = 'resource';
private readonly \Zxing\BinaryBitmap $bitmap;
private readonly \Zxing\Qrcode\QRCodeReader $reader;
private \Zxing\Result|bool|null $result = null;
private ?Exception $error = null;
public function __construct($imgSource, $sourceType = QrReader::SOURCE_TYPE_FILE, $useImagickIfAvailable = true)
{
if (!in_array($sourceType, [
self::SOURCE_TYPE_FILE,
self::SOURCE_TYPE_BLOB,
self::SOURCE_TYPE_RESOURCE,
], true)) {
throw new \InvalidArgumentException('Invalid image source.');
}
$im = null;
switch ($sourceType) {
case QrReader::SOURCE_TYPE_FILE:
if ($useImagickIfAvailable && extension_loaded('imagick')) {
$im = new \Imagick();
$im->readImage($imgSource);
} else {
$image = file_get_contents($imgSource);
$im = imagecreatefromstring($image);
}
break;
case QrReader::SOURCE_TYPE_BLOB:
if ($useImagickIfAvailable && extension_loaded('imagick')) {
$im = new \Imagick();
$im->readImageBlob($imgSource);
} else {
$im = imagecreatefromstring($imgSource);
}
break;
case QrReader::SOURCE_TYPE_RESOURCE:
$im = $imgSource;
if ($useImagickIfAvailable && extension_loaded('imagick')) {
$useImagickIfAvailable = true;
} else {
$useImagickIfAvailable = false;
}
break;
}
if ($useImagickIfAvailable && extension_loaded('imagick')) {
if (!$im instanceof \Imagick) {
throw new \InvalidArgumentException('Invalid image source.');
}
$width = $im->getImageWidth();
$height = $im->getImageHeight();
$source = new IMagickLuminanceSource($im, $width, $height);
} else {
if (!$im instanceof \GdImage && !is_object($im)) {
throw new \InvalidArgumentException('Invalid image source.');
}
$width = imagesx($im);
$height = imagesy($im);
$source = new GDLuminanceSource($im, $width, $height);
}
$histo = new HybridBinarizer($source);
$this->bitmap = new BinaryBitmap($histo);
$this->reader = new QRCodeReader();
}
public function decode($hints = null): void
{
try {
$this->result = $this->reader->decode($this->bitmap, $hints);
} catch (NotFoundException | FormatException | ChecksumException $e) {
$this->result = false;
$this->error = $e;
}
}
public function text($hints = null)
{
$this->decode($hints);
if ($this->result !== false && method_exists($this->result, 'toString')) {
return $this->result->toString();
}
return $this->result;
}
public function getResult(): bool|Result|null
{
return $this->result;
}
public function getError(): Exception|null
{
return $this->error;
}
}
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