Classes List

Swift_CharacterReader_GenericFixedWidthReader

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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. */


/** * Provides fixed-width byte sizes for reading fixed-width character sets. * * @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 */
    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;
    }
}