refactoring

src/Data/Number.php

@@ -13,8 +13,8 @@
 namespace chillerlan\QRCode\Data;
 
 use chillerlan\QRCode\BitBuffer;
+use chillerlan\QRCode\QRCodeException;
 use chillerlan\QRCode\QRConst;
-use chillerlan\QRCode\Util;
 
 /**
  *
@@ -38,21 +38,48 @@ class Number extends QRDataBase implements QRDataInterface{
 		$i = 0;
 
 		while($i + 2 < $this->dataLength){
-			$buffer->put(Util::parseInt(substr($this->data, $i, 3)), 10);
+			$buffer->put($this->parseInt(substr($this->data, $i, 3)), 10);
 			$i += 3;
 		}
 
 		if($i < $this->dataLength){
 
 			if($this->dataLength - $i === 1){
-				$buffer->put(Util::parseInt(substr($this->data, $i, $i + 1)), 4);
+				$buffer->put($this->parseInt(substr($this->data, $i, $i + 1)), 4);
 			}
 			else if($this->dataLength - $i === 2){
-				$buffer->put(Util::parseInt(substr($this->data, $i, $i + 2)), 7);
+				$buffer->put($this->parseInt(substr($this->data, $i, $i + 2)), 7);
 			}
 
 		}
 
 	}
 
+	/**
+	 * @param string $string
+	 *
+	 * @return int
+	 * @throws \chillerlan\QRCode\QRCodeException
+	 */
+	private static function parseInt($string){
+		$num = 0;
+
+		$len = strlen($string);
+		for($i = 0; $i < $len; $i++){
+			$c = ord($string[$i]);
+			$ord0 = ord('0');
+
+			if($ord0 <= $c && $c <= ord('9')){
+				$c = $c - $ord0;
+			}
+			else{
+				throw new QRCodeException('illegal char: '.$c);
+			}
+
+			$num = $num * 10 + $c;
+		}
+
+		return $num;
+	}
+
 }