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vendor/symfony/mime/Encoder/Base64ContentEncoder.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Mime\Encoder;
+
+use Symfony\Component\Mime\Exception\RuntimeException;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+final class Base64ContentEncoder extends Base64Encoder implements ContentEncoderInterface
+{
+    public function encodeByteStream($stream, int $maxLineLength = 0): iterable
+    {
+        if (!\is_resource($stream)) {
+            throw new \TypeError(sprintf('Method "%s" takes a stream as a first argument.', __METHOD__));
+        }
+
+        $filter = stream_filter_append($stream, 'convert.base64-encode', \STREAM_FILTER_READ, [
+            'line-length' => 0 >= $maxLineLength || 76 < $maxLineLength ? 76 : $maxLineLength,
+            'line-break-chars' => "\r\n",
+        ]);
+        if (!\is_resource($filter)) {
+            throw new RuntimeException('Unable to set the base64 content encoder to the filter.');
+        }
+
+        while (!feof($stream)) {
+            yield fread($stream, 16372);
+        }
+        stream_filter_remove($filter);
+    }
+
+    public function getName(): string
+    {
+        return 'base64';
+    }
+}