NativeQpContentEncoder.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_Mime_ContentEncoder_NativeQpContentEncoder implements Swift_Mime_ContentEncoder
{
    private $charset;

    public function __construct($charset = null)
    {
        $this->charset = $charset ? $charset : 'utf-8';
    }

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

    public function encodeByteStream(Swift_OutputByteStream $os, Swift_InputByteStream $is, $firstLineOffset = 0, $maxLineLength = 0)
    {
        if ($this->charset !== 'utf-8') {
            throw new RuntimeException(
                sprintf('Charset "%s" not supported. NativeQpContentEncoder only supports "utf-8"', $this->charset));
        }

        $string = '';

        while (false !== $bytes = $os->read(8192)) {
            $string .= $bytes;
        }

        $is->write($this->encodeString($string));
    }

    public function getName()
    {
        return 'quoted-printable';
    }

    public function encodeString($string, $firstLineOffset = 0, $maxLineLength = 0)
    {
        if ($this->charset !== 'utf-8') {
            throw new RuntimeException(
                sprintf('Charset "%s" not supported. NativeQpContentEncoder only supports "utf-8"', $this->charset));
        }

        return $this->_standardize(quoted_printable_encode($string));
    }

    protected function _standardize($string)
    {
        // transform CR or LF to CRLF
        $string = preg_replace('~=0D(?!=0A)|(?<!=0D)=0A~', '=0D=0A', $string);
        // transform =0D=0A to CRLF
        $string = str_replace(array("\t=0D=0A", ' =0D=0A', '=0D=0A'), array("=09\r\n", "=20\r\n", "\r\n"), $string);

        switch ($end = ord(substr($string, -1))) {
            case 0x09:
                $string = substr_replace($string, '=09', -1);
                break;
            case 0x20:
                $string = substr_replace($string, '=20', -1);
                break;
        }

        return $string;
    }
}