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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.
*
* @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 Swift_OutputByteStream $os
* @param Swift_InputByteStream $is
* @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 = array();
$lineCount = 0;
foreach ($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(
array("\r\n", "\r", "\n"),
array("\n", "\n", "\r\n"),
$string
);
}
}
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