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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.
*/
//@require 'Swift/CharacterReader.php';
/**
* Provides fixed-width byte sizes for reading fixed-width character sets.
* @package Swift
* @subpackage Encoder
* @author Chris Corbyn
* @author Xavier De Cock <xdecock@gmail.com>
*/
class Swift_CharacterReader_GenericFixedWidthReader
implements Swift_CharacterReader
{
/**
* The number of bytes in a single character.
* @var int
* @access private
*/
private $_width;
/**
* Creates a new GenericFixedWidthReader using $width bytes per character.
* @param int $width
*/
public function __construct($width)
{
$this->_width = $width;
}
/**
* Returns the complete charactermap
*
* @param string $string
* @param int $startOffset
* @param array $currentMap
* @param mixed $ignoredChars
* @return $int
*/
public function getCharPositions($string, $startOffset, &$currentMap, &$ignoredChars)
{
$strlen = strlen($string);
// % and / are CPU intensive, so, maybe find a better way
$ignored = $strlen%$this->_width;
$ignoredChars = substr($string, - $ignored);
$currentMap = $this->_width;
return ($strlen - $ignored)/$this->_width;
}
/**
* Returns mapType
* @int mapType
*/
public function getMapType()
{
return self::MAP_TYPE_FIXED_LEN;
}
/**
* 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)
{
$needed = $this->_width - $size;
return ($needed > -1)
? $needed
: -1
;
}
/**
* Returns the number of bytes which should be read to start each character.
* @return int
*/
public function getInitialByteSize()
{
return $this->_width;
}
}
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