EasyWeChat\Support\File

Complexity

Total Complexity

5

Size/Duplication

Total Lines	81
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	0

Importance

Changes	4
Bugs	1	Features	0

2 Methods

Rating	Name	Duplication	Size	Complexity
A	getStreamExt()	0	8	2
A	getExtBySignature()	0	12	3

<?php

/*
 * This file is part of the overtrue/wechat.
 *
 * (c) overtrue <i@overtrue.me>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

/**
 * File.php.
 *
 * @author    overtrue <i@overtrue.me>
 * @copyright 2015 overtrue <i@overtrue.me>
 *
 * @link      https://github.com/overtrue
 * @link      http://overtrue.me
 */
namespace EasyWeChat\Support;

use finfo;

/**
 * Class File.
 */
class File
{
    /**
     * MIME mapping.
     *
     * @var array
     */
    protected static $extensionMap = array(
        'audio/wav' => '.wav',
        'audio/x-ms-wma' => '.wma',
        'video/x-ms-wmv' => '.wmv',
        'video/mp4' => '.mp4',
        'audio/mpeg' => '.mp3',
        'audio/amr' => '.amr',
        'application/vnd.rn-realmedia' => '.rm',
        'audio/mid' => '.mid',
        'image/bmp' => '.bmp',
        'image/gif' => '.gif',
        'image/png' => '.png',
        'image/tiff' => '.tiff',
        'image/jpeg' => '.jpg',
    );

    /**
     * File header signatures.
     *
     * @var array
     */
    protected static $signatures = [
        'ffd8ff' => '.jpg',
        '424d' => '.bmp',
        '47494638' => '.gif',
        '89504e47' => '.png',
        '494433' => '.mp3',
        'fffb' => '.mp3',
        'fff3' => '.mp3',
        '3026b2758e66cf11' => '.wma',
        '52494646' => '.wav',
        '57415645' => '.wav',
        '41564920' => '.avi',
        '000001ba' => '.mpg',
        '000001b3' => '.mpg',
        '2321414d52' => '.amr',
    ];

    /**
     * Return steam extension.
     *
     * @param string $stream
     *
     * @return string
     */
    public static function getStreamExt($stream)
    {
        $finfo = new finfo(FILEINFO_MIME);

        $mime = strstr($finfo->buffer($stream), ';', true);

        return isset(self::$extensionMap[$mime]) ? self::$extensionMap[$mime] : self::getExtBySignature($stream);
    }

    /**
     * Get file extension by file header signature.
     *
     * @param string $stream
     *
     * @return string
     */
    public static function getExtBySignature($stream)
    {
        $prefix = strval(bin2hex(mb_strcut($stream, 0, 10)));

        foreach (self::$signatures as $signature => $extension) {
            if (0 === strpos($prefix, strval($signature))) {
                return $extension;
            }
        }

        return '';
    }
}