<?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.
*
* @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
*/
private $charStream;
/**
* Creates a new Rfc2231Encoder using the given character stream instance.
*/
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
* @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 = [];
$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);
}
/**
* Make a deep copy of object.
*/
public function __clone()
{
$this->charStream = clone $this->charStream;
}
}