98 lines
2.3 KiB
PHP
98 lines
2.3 KiB
PHP
<?php
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/*
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* This file is part of SwiftMailer.
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* (c) 2004-2009 Chris Corbyn
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* Provides fixed-width byte sizes for reading fixed-width character sets.
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*
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* @author Chris Corbyn
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* @author Xavier De Cock <xdecock@gmail.com>
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*/
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class Swift_CharacterReader_GenericFixedWidthReader implements Swift_CharacterReader
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{
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/**
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* The number of bytes in a single character.
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*
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* @var int
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*/
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private $width;
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/**
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* Creates a new GenericFixedWidthReader using $width bytes per character.
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*
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* @param int $width
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*/
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public function __construct($width)
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{
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$this->width = $width;
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}
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/**
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* Returns the complete character map.
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*
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* @param string $string
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* @param int $startOffset
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* @param array $currentMap
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* @param mixed $ignoredChars
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*
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* @return int
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*/
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public function getCharPositions($string, $startOffset, &$currentMap, &$ignoredChars)
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{
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$strlen = \strlen($string);
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// % and / are CPU intensive, so, maybe find a better way
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$ignored = $strlen % $this->width;
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$ignoredChars = $ignored ? substr($string, -$ignored) : '';
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$currentMap = $this->width;
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return ($strlen - $ignored) / $this->width;
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}
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/**
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* Returns the mapType.
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*
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* @return int
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*/
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public function getMapType()
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{
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return self::MAP_TYPE_FIXED_LEN;
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}
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/**
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* Returns an integer which specifies how many more bytes to read.
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*
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* A positive integer indicates the number of more bytes to fetch before invoking
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* this method again.
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*
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* A value of zero means this is already a valid character.
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* A value of -1 means this cannot possibly be a valid character.
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*
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* @param string $bytes
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* @param int $size
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*
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* @return int
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*/
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public function validateByteSequence($bytes, $size)
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{
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$needed = $this->width - $size;
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return $needed > -1 ? $needed : -1;
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}
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/**
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* Returns the number of bytes which should be read to start each character.
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*
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* @return int
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*/
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public function getInitialByteSize()
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{
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return $this->width;
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}
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}
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