<?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.

 */

/**

 * Analyzes US-ASCII characters.

 * @package Swift

 * @subpackage Encoder

 * @author Chris Corbyn

 */

class Swift_CharacterReader_UsAsciiReader

  implements Swift_CharacterReader

{

  /**

   * Returns the complete charactermap

   *

   * @param string $string

   * @param int $startOffset

   * @param string $ignoredChars

   */

  public function getCharPositions($string, $startOffset, &$currentMap, &$ignoredChars)

  {

  	$strlen=strlen($string);

  	$ignoredChars='';

  	for( $i = 0; $i < $strlen; ++$i)

  	{

  	  if ($string[$i]>"\x07F")

  	  { // Invalid char

  	  	$currentMap[$i+$startOffset]=$string[$i];

  	  }

  	}

  	return $strlen;

  }

  /**

   * Returns mapType

   * @int mapType

   */

  public function getMapType()

  {

  	return self::MAP_TYPE_INVALID;

  }

  /**

   * Returns an integer which specifies how many more bytes to read.

   * A positive integer indicates the number of more bytes to fetch before invoking

   * this method again.

   * A value of zero means this is already a valid character.

   * A value of -1 means this cannot possibly be a valid character.

   * @param string $bytes

   * @return int

   */

  public function validateByteSequence($bytes, $size)

  {

    $byte = reset($bytes);

    if (1 == count($bytes) && $byte >= 0x00 && $byte <= 0x7F)

    {

      return 0;

    }

    else

    {

      return -1;

    }

  }

  /**

   * Returns the number of bytes which should be read to start each character.

   * @return int

   */

  public function getInitialByteSize()

  {

    return 1;

  }

}