heiglandreas/OrgHeiglFileFinder

<?php
/**
 * Copyright (c)2014-2014 heiglandreas
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIBILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @category 
 * @author    Andreas Heigl<andreas@heigl.org>
 * @copyright ©2014-2014 Andreas Heigl
 * @license   http://www.opesource.org/licenses/mit-license.php MIT-License
 * @version   0.0
 * @since     05.11.14
 * @link      https://github.com/heiglandreas/
 */

namespace Org_Heigl\FileFinder\Filter;


use Org_Heigl\FileFinder\FilterInterface;

class FileStart implements FilterInterface
{

    /**
     * @var int $length
     */
    protected $length = 0;

    /**
     * @var string $contains
     */
    protected $contains = '';

    /**
     * Check whether the given file should be included in the final Filelist
     *
     * @param \SplFileInfo $file
     *
     * @return boolean
     */
    public function filter(\SplFileInfo $file)
    {
        $fh = fopen($file->getPathName(), 'r');
        $content = fread($fh, $this->length);
        fclose($fh);

        return false !== strpos($content, $this->contains);
    }

    /**
     * Create an instance of the filter.
     * This filter checks whether the given file starts with the given string in
     * the first *length* bytes
     *
     * @param string $contains
     * @param int    $bytes
     *
     * @return void
     */
    public function __construct($contains, $bytes = 0)
    {
        $this->contains = $contains;
        if (! $bytes) {
            $bytes = mb_strlen($this->contains);
        }

        $this->length = $bytes;
    }
}