<?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.

 * @package Swift

 * @subpackage Mime

 * @author Chris Corbyn

 */

class Swift_Mime_ContentEncoder_QpContentEncoder extends Swift_Encoder_QpEncoder

  implements Swift_Mime_ContentEncoder

{

  /**

   * Creates a new QpContentEncoder for the given CharacterStream.

   * @param Swift_CharacterStream $charStream to use for reading characters

   * @param Swift_StreamFilter $filter if canonicalization should occur

   * @param boolean $dotEscape if dot stuffing workaround must be enabled

   */

  public function __construct(Swift_CharacterStream $charStream,

    Swift_StreamFilter $filter = null, $dotEscape=false)

  {

    parent::__construct($charStream, $filter);

    if ($dotEscape) {

      /* Encode . as =2e for buggy remote servers */

      unset($this->_safeMap[0x2e]);

    }

  }

  /**

   * Encode stream $in to stream $out.

   * QP encoded strings have a maximum line length of 76 characters.

   * If the first line needs to be shorter, indicate the difference with

   * $firstLineOffset.

   * @param Swift_OutputByteStream $os output stream

   * @param Swift_InputByteStream $is input stream

   * @param int $firstLineOffset

   * @param int $maxLineLength

   */

  public function encodeByteStream(

    Swift_OutputByteStream $os, Swift_InputByteStream $is, $firstLineOffset = 0,

    $maxLineLength = 0)

  {

    if ($maxLineLength > 76 || $maxLineLength <= 0)

    {

      $maxLineLength = 76;

    }

    $thisLineLength = $maxLineLength - $firstLineOffset;

    $this->_charStream->flushContents();

    $this->_charStream->importByteStream($os);

    $currentLine = '';

    $prepend = '';

    $size=$lineLen=0;

    while (false !== $bytes = $this->_nextSequence())

    {

      //If we're filtering the input

      if (isset($this->_filter))

      {

        //If we can't filter because we need more bytes

        while ($this->_filter->shouldBuffer($bytes))

        {

          //Then collect bytes into the buffer

          if (false === $moreBytes = $this->_nextSequence(1))

          {

            break;

          }

          foreach ($moreBytes as $b)

          {

            $bytes[] = $b;

          }

        }

        //And filter them

        $bytes = $this->_filter->filter($bytes);

      }

      $enc = $this->_encodeByteSequence($bytes, $size);

      if ($currentLine && $lineLen+$size >= $thisLineLength)

      {

        $is->write($prepend . $this->_standardize($currentLine));

        $currentLine = '';

        $prepend = "=\r\n";

        $thisLineLength = $maxLineLength;

        $lineLen=0;

      }

      $lineLen+=$size;

      $currentLine .= $enc;

    }

    if (strlen($currentLine))

    {

      $is->write($prepend . $this->_standardize($currentLine));

    }

  }

  /**

   * Get the name of this encoding scheme.

   * Returns the string 'quoted-printable'.

   * @return string

   */

  public function getName()

  {

    return 'quoted-printable';

  }

}