<?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 Quoted Printable (QP) Transfer Encoding in Swift Mailer using the PHP core function.
*
* @author Lars Strojny
*/
class Swift_Mime_ContentEncoder_NativeQpContentEncoder implements Swift_Mime_ContentEncoder
{
/**
* @var null|string
*/
private $charset;
/**
* @param null|string $charset
*/
public function __construct($charset = null)
{
$this->charset = $charset ? $charset : 'utf-8';
}
/**
* Notify this observer that the entity's charset has changed.
*
* @param string $charset
*/
public function charsetChanged($charset)
{
$this->charset = $charset;
}
/**
* Encode $in to $out.
*
* @param Swift_OutputByteStream $os to read from
* @param Swift_InputByteStream $is to write to
* @param int $firstLineOffset
* @param int $maxLineLength 0 indicates the default length for this encoding
*
* @throws RuntimeException
*/
public function encodeByteStream(Swift_OutputByteStream $os, Swift_InputByteStream $is, $firstLineOffset = 0, $maxLineLength = 0)
{
if ('utf-8' !== $this->charset) {
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));
}
/**
* Get the MIME name of this content encoding scheme.
*
* @return string
*/
public function getName()
{
return 'quoted-printable';
}
/**
* Encode a given string to produce an encoded string.
*
* @param string $string
* @param int $firstLineOffset if first line needs to be shorter
* @param int $maxLineLength 0 indicates the default length for this encoding
*
* @throws RuntimeException
*
* @return string
*/
public function encodeString($string, $firstLineOffset = 0, $maxLineLength = 0)
{
if ('utf-8' !== $this->charset) {
throw new RuntimeException(
sprintf('Charset "%s" not supported. NativeQpContentEncoder only supports "utf-8"', $this->charset));
}
return $this->standardize(quoted_printable_encode($string));
}
/**
* Make sure CRLF is correct and HT/SPACE are in valid places.
*
* @param string $string
*
* @return string
*/
protected function standardize($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(["\t=0D=0A", ' =0D=0A', '=0D=0A'], ["=09\r\n", "=20\r\n", "\r\n"], $string);
switch (ord(substr($string, -1))) {
case 0x09:
$string = substr_replace($string, '=09', -1);
break;
case 0x20:
$string = substr_replace($string, '=20', -1);
break;
}
return $string;
}
}