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include/swiftmailer/lib/classes/Swift/Mime/ContentEncoder/PlainContentEncoder.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 binary/7/8-bit Transfer Encoding in Swift Mailer.
+ *
+ * When sending 8-bit content over SMTP, you should use
+ * Swift_Transport_Esmtp_EightBitMimeHandler to enable the 8BITMIME SMTP
+ * extension.
+ *
+ * @author Chris Corbyn
+ */
+class Swift_Mime_ContentEncoder_PlainContentEncoder implements Swift_Mime_ContentEncoder
+{
+    /**
+     * The name of this encoding scheme (probably 7bit or 8bit).
+     *
+     * @var string
+     */
+    private $name;
+
+    /**
+     * True if canonical transformations should be done.
+     *
+     * @var bool
+     */
+    private $canonical;
+
+    /**
+     * Creates a new PlainContentEncoder with $name (probably 7bit or 8bit).
+     *
+     * @param string $name
+     * @param bool   $canonical if canonicalization transformation should be done
+     */
+    public function __construct($name, $canonical = false)
+    {
+        $this->name = $name;
+        $this->canonical = $canonical;
+    }
+
+    /**
+     * Encode a given string to produce an encoded string.
+     *
+     * @param string $string
+     * @param int    $firstLineOffset ignored
+     * @param int    $maxLineLength   - 0 means no wrapping will occur
+     *
+     * @return string
+     */
+    public function encodeString($string, $firstLineOffset = 0, $maxLineLength = 0)
+    {
+        if ($this->canonical) {
+            $string = $this->canonicalize($string);
+        }
+
+        return $this->safeWordwrap($string, $maxLineLength, "\r\n");
+    }
+
+    /**
+     * Encode stream $in to stream $out.
+     *
+     * @param int $firstLineOffset ignored
+     * @param int $maxLineLength   optional, 0 means no wrapping will occur
+     */
+    public function encodeByteStream(Swift_OutputByteStream $os, Swift_InputByteStream $is, $firstLineOffset = 0, $maxLineLength = 0)
+    {
+        $leftOver = '';
+        while (false !== $bytes = $os->read(8192)) {
+            $toencode = $leftOver.$bytes;
+            if ($this->canonical) {
+                $toencode = $this->canonicalize($toencode);
+            }
+            $wrapped = $this->safeWordwrap($toencode, $maxLineLength, "\r\n");
+            $lastLinePos = strrpos($wrapped, "\r\n");
+            $leftOver = substr($wrapped, $lastLinePos);
+            $wrapped = substr($wrapped, 0, $lastLinePos);
+
+            $is->write($wrapped);
+        }
+        if (\strlen($leftOver)) {
+            $is->write($leftOver);
+        }
+    }
+
+    /**
+     * Get the name of this encoding scheme.
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * Not used.
+     */
+    public function charsetChanged($charset)
+    {
+    }
+
+    /**
+     * A safer (but weaker) wordwrap for unicode.
+     *
+     * @param string $string
+     * @param int    $length
+     * @param string $le
+     *
+     * @return string
+     */
+    private function safeWordwrap($string, $length = 75, $le = "\r\n")
+    {
+        if (0 >= $length) {
+            return $string;
+        }
+
+        $originalLines = explode($le, $string);
+
+        $lines = [];
+        $lineCount = 0;
+
+        foreach ($originalLines as $originalLine) {
+            $lines[] = '';
+            $currentLine = &$lines[$lineCount++];
+
+            //$chunks = preg_split('/(?<=[\ \t,\.!\?\-&\+\/])/', $originalLine);
+            $chunks = preg_split('/(?<=\s)/', $originalLine);
+
+            foreach ($chunks as $chunk) {
+                if (0 != \strlen($currentLine)
+                    && \strlen($currentLine.$chunk) > $length) {
+                    $lines[] = '';
+                    $currentLine = &$lines[$lineCount++];
+                }
+                $currentLine .= $chunk;
+            }
+        }
+
+        return implode("\r\n", $lines);
+    }
+
+    /**
+     * Canonicalize string input (fix CRLF).
+     *
+     * @param string $string
+     *
+     * @return string
+     */
+    private function canonicalize($string)
+    {
+        return str_replace(
+            ["\r\n", "\r", "\n"],
+            ["\n", "\n", "\r\n"],
+            $string
+            );
+    }
+}