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include/swiftmailer/lib/classes/Swift/Mime/ContentEncoder/Base64ContentEncoder.php

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+<?php
+
+/*
+ * This file is part of SwiftMailer.
+ * (c) 2004-2009 Chris Corbyn
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Handles Base 64 Transfer Encoding in Swift Mailer.
+ *
+ * @author Chris Corbyn
+ */
+class Swift_Mime_ContentEncoder_Base64ContentEncoder extends Swift_Encoder_Base64Encoder implements Swift_Mime_ContentEncoder
+{
+    /**
+     * Encode stream $in to stream $out.
+     *
+     * @param int $firstLineOffset
+     */
+    public function encodeByteStream(Swift_OutputByteStream $os, Swift_InputByteStream $is, $firstLineOffset = 0, $maxLineLength = 0)
+    {
+        if (0 >= $maxLineLength || 76 < $maxLineLength) {
+            $maxLineLength = 76;
+        }
+
+        $remainder = 0;
+        $base64ReadBufferRemainderBytes = null;
+
+        // To reduce memory usage, the output buffer is streamed to the input buffer like so:
+        //   Output Stream => base64encode => wrap line length => Input Stream
+        // HOWEVER it's important to note that base64_encode() should only be passed whole triplets of data (except for the final chunk of data)
+        // otherwise it will assume the input data has *ended* and it will incorrectly pad/terminate the base64 data mid-stream.
+        // We use $base64ReadBufferRemainderBytes to carry over 1-2 "remainder" bytes from the each chunk from OutputStream and pre-pend those onto the
+        // chunk of bytes read in the next iteration.
+        // When the OutputStream is empty, we must flush any remainder bytes.
+        while (true) {
+            $readBytes = $os->read(8192);
+            $atEOF = (false === $readBytes);
+
+            if ($atEOF) {
+                $streamTheseBytes = $base64ReadBufferRemainderBytes;
+            } else {
+                $streamTheseBytes = $base64ReadBufferRemainderBytes.$readBytes;
+            }
+            $base64ReadBufferRemainderBytes = null;
+            $bytesLength = \strlen($streamTheseBytes);
+
+            if (0 === $bytesLength) { // no data left to encode
+                break;
+            }
+
+            // if we're not on the last block of the ouput stream, make sure $streamTheseBytes ends with a complete triplet of data
+            // and carry over remainder 1-2 bytes to the next loop iteration
+            if (!$atEOF) {
+                $excessBytes = $bytesLength % 3;
+                if (0 !== $excessBytes) {
+                    $base64ReadBufferRemainderBytes = substr($streamTheseBytes, -$excessBytes);
+                    $streamTheseBytes = substr($streamTheseBytes, 0, $bytesLength - $excessBytes);
+                }
+            }
+
+            $encoded = base64_encode($streamTheseBytes);
+            $encodedTransformed = '';
+            $thisMaxLineLength = $maxLineLength - $remainder - $firstLineOffset;
+
+            while ($thisMaxLineLength < \strlen($encoded)) {
+                $encodedTransformed .= substr($encoded, 0, $thisMaxLineLength)."\r\n";
+                $firstLineOffset = 0;
+                $encoded = substr($encoded, $thisMaxLineLength);
+                $thisMaxLineLength = $maxLineLength;
+                $remainder = 0;
+            }
+
+            if (0 < $remainingLength = \strlen($encoded)) {
+                $remainder += $remainingLength;
+                $encodedTransformed .= $encoded;
+                $encoded = null;
+            }
+
+            $is->write($encodedTransformed);
+
+            if ($atEOF) {
+                break;
+            }
+        }
+    }
+
+    /**
+     * Get the name of this encoding scheme.
+     * Returns the string 'base64'.
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        return 'base64';
+    }
+}