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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.
* @package Swift
* @subpackage Encoder
* @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
* @access private
*/
private $_charStream;
/**
* Creates a new Rfc2231Encoder using the given character stream instance.
* @param Swift_CharacterStream
*/
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 to encode
* @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 = 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);
}
/**
* Updates the charset used.
* @param string $charset
*/
public function charsetChanged($charset)
{
$this->_charStream->setCharacterSet($charset);
}
}