<?php

namespace ImageMimeTypeGuesser\Detectors;

class SniffFirstFourBytes extends AbstractDetector
{
    /**
     * Try to detect mime type by sniffing the first four bytes.
     *
     * Credits: Based on the code here: http://phil.lavin.me.uk/2011/12/php-accurately-detecting-the-type-of-a-file/
     *
     * Returns:
     * - mime type (string) (if it is in fact an image, and type could be determined)
     * - false (if it is not an image type that the server knowns about)
     * - null  (if nothing can be determined)
     *
     * @param  string  $filePath  The path to the file
     * @return string|false|null  mimetype (if it is an image, and type could be determined),
     *    false (if it is not an image type that the server knowns about)
     *    or null (if nothing can be determined)
     */
    protected function doDetect($filePath)
    {
        // PNG, GIF, JFIF JPEG, EXIF JPEF (respectively)
        $known = [
            '89504E47' => 'image/png',
            '47494638' => 'image/gif',
            'FFD8FFE0' => 'image/jpeg',  //  JFIF JPEG
            "FFD8FFE1" => 'image/jpeg',  //  EXIF JPEG
        ];

        $handle = @fopen($filePath, 'r');
        if ($handle === false) {
            return null;
        }
        $firstFour = @fread($handle, 4);
        if ($firstFour === false) {
            return null;
        }
        $key = strtoupper(bin2hex($firstFour));
        if (isset($known[$key])) {
            return $known[$key];
        }
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NjQ3Njk3MzA4Nzk0Mjg0NSA4ODU5OTY2NjMxNjA0MjU3IDIxNTc3NTk5Njg4MDI5Mw==