Merge pull request #139 from GenieTim/master

Fix issue where in some cases the bits could be decoded to the neighbouring char

Author: khanamiryan

lib/ChecksumException.php

@@ -27,7 +27,7 @@ final class ChecksumException extends ReaderException
 {
 	private static ?\Zxing\ChecksumException $instance = null;
 
-	public static function getChecksumInstance($cause = null): self
+	public static function getChecksumInstance($cause = ""): self
 	{
 		if (self::$isStackTrace) {
 			return new ChecksumException($cause);

lib/Common/HybridBinarizer.php

@@ -266,7 +266,7 @@ private static function thresholdBlock(
 		for ($y = 0, $offset = $yoffset * $stride + $xoffset; $y < self::$BLOCK_SIZE; $y++, $offset += $stride) {
 			for ($x = 0; $x < self::$BLOCK_SIZE; $x++) {
 				// Comparison needs to be <= so that black == 0 pixels are black even if the threshold is 0.
-				if (($luminances[(int)round($offset + $x)] & 0xFF) <= $threshold) {
+				if ((((int)$luminances[(int)round($offset + $x)]) & 0xFF) <= $threshold) {
 					$matrix->set($xoffset + $x, $yoffset + $y);
 				}
 			}

lib/Qrcode/Decoder/DecodedBitStreamParser.php

@@ -208,8 +208,8 @@ private static function decodeNumericSegment(
 			if ($threeDigitsBits >= 1000) {
 				throw new FormatException("Too many three digit bits");
 			}
-			$result .= (self::toAlphaNumericChar($threeDigitsBits / 100));
-			$result .= (self::toAlphaNumericChar(((int)round($threeDigitsBits / 10)) % 10));
+			$result .= (self::toAlphaNumericChar(intdiv($threeDigitsBits, 100)));
+			$result .= (self::toAlphaNumericChar(intdiv($threeDigitsBits, 10) % 10));
 			$result .= (self::toAlphaNumericChar($threeDigitsBits % 10));
 			$count -= 3;
 		}
@@ -222,7 +222,7 @@ private static function decodeNumericSegment(
 			if ($twoDigitsBits >= 100) {
 				throw new FormatException("Too many bits: $twoDigitsBits expected < 100");
 			}
-			$result .= (self::toAlphaNumericChar($twoDigitsBits / 10));
+			$result .= (self::toAlphaNumericChar(intdiv($twoDigitsBits, 10)));
 			$result .= (self::toAlphaNumericChar($twoDigitsBits % 10));
 		} elseif ($count == 1) {
 			// One digit left over to read
@@ -263,7 +263,7 @@ private static function decodeAlphanumericSegment(
 				throw new FormatException("Not enough bits available to read two expected characters");
 			}
 			$nextTwoCharsBits = $bits->readBits(11);
-			$result .= (self::toAlphaNumericChar($nextTwoCharsBits / 45));
+			$result .= (self::toAlphaNumericChar(intdiv($nextTwoCharsBits, 45)));
 			$result .= (self::toAlphaNumericChar($nextTwoCharsBits % 45));
 			$count -= 2;
 		}