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.
 */

class Swift_Encoder_Rfc2231Encoder implements Swift_Encoder
{
    private $_charStream;

    public function __construct(Swift_CharacterStream $charStream)
    {
        $this->_charStream = $charStream;
    }

    public function encodeString($string, $firstLineOffset = 0, $maxLineLength = 0)
    {
        $lines = array();
        $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);
    }

    public function charsetChanged($charset)
    {
        $this->_charStream->setCharacterSet($charset);
    }

    public function __clone()
    {
        $this->_charStream = clone $this->_charStream;
    }
}