<?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.
*/
/**
* Provides fixed-width byte sizes for reading fixed-width character sets.
*
* @author Chris Corbyn
* @author Xavier De Cock <[email protected]>
*/
class Swift_CharacterReader_GenericFixedWidthReader implements Swift_CharacterReader
{
/**
* The number of bytes in a single character.
*
* @var int
*/
private $_width;
/**
* Creates a new GenericFixedWidthReader using $width bytes per character.
*
* @param int $width
*/
public function __construct($width)
{
$this->_width = $width;
}
/**
* Returns the complete character map.
*
* @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 = $ignored ? substr($string, -$ignored) : '';
$currentMap = $this->_width;
return ($strlen - $ignored) / $this->_width;
}
/**
* Returns the mapType.
*
* @return int
*/
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
* @param int $size
*
* @return int
*/
public function validateByteSequence($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;
}
}