fix: correctly encode kanji bytes

Author: askdkc

src/Encoder/Encoder.php

@@ -222,7 +222,7 @@ private static function isOnlyDoubleByteKanji(string $content) : bool
         }
 
         for ($i = 0; $i < $length; $i += 2) {
-            $byte = $bytes[$i] & 0xff;
+            $byte = ord($bytes[$i]) & 0xff;
 
             if (($byte < 0x81 || $byte > 0x9f) && $byte < 0xe0 || $byte > 0xeb) {
                 return false;
@@ -634,17 +634,23 @@ private static function append8BitBytes(string $content, BitArray $bits, string
      */
     private static function appendKanjiBytes(string $content, BitArray $bits) : void
     {
-        if (strlen($content) % 2 > 0) {
+        $bytes = @iconv('utf-8', 'SHIFT-JIS', $content);
+
+        if (false === $bytes) {
+            throw new WriterException('Content could not be converted to SHIFT-JIS');
+        }
+
+        if (strlen($bytes) % 2 > 0) {
             // We just do a simple length check here. The for loop will check
             // individual characters.
             throw new WriterException('Content does not seem to be encoded in SHIFT-JIS');
         }
 
-        $length = strlen($content);
+        $length = strlen($bytes);
 
         for ($i = 0; $i < $length; $i += 2) {
-            $byte1 = ord($content[$i]) & 0xff;
-            $byte2 = ord($content[$i + 1]) & 0xff;
+            $byte1 = ord($bytes[$i]) & 0xff;
+            $byte2 = ord($bytes[$i + 1]) & 0xff;
             $code = ($byte1 << 8) | $byte2;
 
             if ($code >= 0x8140 && $code <= 0x9ffc) {

test/Encoder/EncoderTest.php

@@ -287,11 +287,11 @@ public function testAppendBytes() : void
         $this->assertSame(' .XX....X .XX...X. .XX...XX', (string) $bits);
 
         // Should use appendKanjiBytes.
-        // 0x93, 0x5f
+        // 0x93, 0x5f :点
         $bits = new BitArray();
         $this->methods['appendBytes']->invoke(
             null,
-            "\x93\x5f",
+            '点',
             Mode::KANJI(),
             $bits,
             Encoder::DEFAULT_BYTE_MODE_ENCODING
@@ -477,12 +477,12 @@ public function testAppend8BitBytes() : void
 
     public function testAppendKanjiBytes() : void
     {
-        // Numbers are from page 21 of JISX0510:2004
+        // Numbers are from page 21 of JISX0510:2004 点 and 茗
         $bits = new BitArray();
-        $this->methods['appendKanjiBytes']->invoke(null, "\x93\x5f", $bits);
+        $this->methods['appendKanjiBytes']->invoke(null, '点', $bits);
         $this->assertSame(' .XX.XX.. XXXXX', (string) $bits);
 
-        $this->methods['appendKanjiBytes']->invoke(null, "\xe4\xaa", $bits);
+        $this->methods['appendKanjiBytes']->invoke(null, '茗', $bits);
         $this->assertSame(' .XX.XX.. XXXXXXX. X.X.X.X. X.', (string) $bits);
     }