refactor: remove redundant "& 0xFF" masks from ord() and BitArray (#203)

* Remove redundant "& 0xFF" masks from ord() calls

These masks were carried over from C-style code, where "& 0xFF" is used to
prevent sign-extension when promoting signed chars (-128..127) to ints. In that
context, masking ensures the value is treated as an unsigned byte (0..255).

In PHP, however, ord() already returns an integer in the range 0–255, making
the extra "& 0xFF" operation unnecessary.

* Remove redundant "& 0xFF" mask in BitArray::generateEcBytes()

The mask was carried over from C-style code, where "& 0xFF" is used to prevent
sign-extension when promoting signed chars (-128..127) to ints.

In PHP, however, BitArray::toBytes() already produces values in the range 0–255,
making the extra mask operation unnecessary.

Author: vlakoff

src/Encoder/Encoder.php

@@ -222,7 +222,7 @@ private static function isOnlyDoubleByteKanji(string $content) : bool
         }
 
         for ($i = 0; $i < $length; $i += 2) {
-            $byte = ord($bytes[$i]) & 0xff;
+            $byte = ord($bytes[$i]);
 
             if (($byte < 0x81 || $byte > 0x9f) && $byte < 0xe0 || $byte > 0xeb) {
                 return false;
@@ -457,7 +457,7 @@ private static function generateEcBytes(SplFixedArray $dataBytes, int $numEcByte
         $toEncode = new SplFixedArray($numDataBytes + $numEcBytesInBlock);
 
         for ($i = 0; $i < $numDataBytes; $i++) {
-            $toEncode[$i] = $dataBytes[$i] & 0xff;
+            $toEncode[$i] = $dataBytes[$i];
         }
 
         $ecBytes = new SplFixedArray($numEcBytesInBlock);
@@ -649,8 +649,8 @@ private static function appendKanjiBytes(string $content, BitArray $bits) : void
         $length = strlen($bytes);
 
         for ($i = 0; $i < $length; $i += 2) {
-            $byte1 = ord($bytes[$i]) & 0xff;
-            $byte2 = ord($bytes[$i + 1]) & 0xff;
+            $byte1 = ord($bytes[$i]);
+            $byte2 = ord($bytes[$i + 1]);
             $code = ($byte1 << 8) | $byte2;
 
             if ($code >= 0x8140 && $code <= 0x9ffc) {