<?php

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;
    }
}
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