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include/swiftmailer/lib/classes/Swift/Encoder/Rfc2231Encoder.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 RFC 2231 specified Encoding in Swift Mailer.
+ *
+ * @author Chris Corbyn
+ */
+class Swift_Encoder_Rfc2231Encoder implements Swift_Encoder
+{
+    /**
+     * A character stream to use when reading a string as characters instead of bytes.
+     *
+     * @var Swift_CharacterStream
+     */
+    private $charStream;
+
+    /**
+     * Creates a new Rfc2231Encoder using the given character stream instance.
+     */
+    public function __construct(Swift_CharacterStream $charStream)
+    {
+        $this->charStream = $charStream;
+    }
+
+    /**
+     * Takes an unencoded string and produces a string encoded according to
+     * RFC 2231 from it.
+     *
+     * @param string $string
+     * @param int    $firstLineOffset
+     * @param int    $maxLineLength   optional, 0 indicates the default of 75 bytes
+     *
+     * @return string
+     */
+    public function encodeString($string, $firstLineOffset = 0, $maxLineLength = 0)
+    {
+        $lines = [];
+        $lineCount = 0;
+        $lines[] = '';
+        $currentLine = &$lines[$lineCount++];
+
+        if (0 >= $maxLineLength) {
+            $maxLineLength = 75;
+        }
+
+        $this->charStream->flushContents();
+        $this->charStream->importString($string);
+
+        $thisLineLength = $maxLineLength - $firstLineOffset;
+
+        while (false !== $char = $this->charStream->read(4)) {
+            $encodedChar = rawurlencode($char);
+            if (0 != \strlen($currentLine)
+                && \strlen($currentLine.$encodedChar) > $thisLineLength) {
+                $lines[] = '';
+                $currentLine = &$lines[$lineCount++];
+                $thisLineLength = $maxLineLength;
+            }
+            $currentLine .= $encodedChar;
+        }
+
+        return implode("\r\n", $lines);
+    }
+
+    /**
+     * Updates the charset used.
+     *
+     * @param string $charset
+     */
+    public function charsetChanged($charset)
+    {
+        $this->charStream->setCharacterSet($charset);
+    }
+
+    /**
+     * Make a deep copy of object.
+     */
+    public function __clone()
+    {
+        $this->charStream = clone $this->charStream;
+    }
+}