FileInfo.php

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<?php
namespace TYPO3\CMS\Core\Type\File;

use TYPO3\CMS\Core\Type\TypeInterface;

class FileInfo extends \SplFileInfo implements TypeInterface
{
    public function getMimeType()
    {
        $mimeType = false;
        if ($this->isFile()) {
            $fileExtensionToMimeTypeMapping = $GLOBALS['TYPO3_CONF_VARS']['SYS']['FileInfo']['fileExtensionToMimeType'];
            $lowercaseFileExtension = strtolower($this->getExtension());
            if (!empty($fileExtensionToMimeTypeMapping[$lowercaseFileExtension])) {
                $mimeType = $fileExtensionToMimeTypeMapping[$lowercaseFileExtension];
            } else {
                if (function_exists('finfo_file')) {
                    $fileInfo = new \finfo();
                    $mimeType = $fileInfo->file($this->getPathname(), FILEINFO_MIME_TYPE);
                } elseif (function_exists('mime_content_type')) {
                    $mimeType = mime_content_type($this->getPathname());
                }
            }
        }

        if (isset($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS'][\TYPO3\CMS\Core\Type\File\FileInfo::class]['mimeTypeGuessers'])
            && is_array($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS'][\TYPO3\CMS\Core\Type\File\FileInfo::class]['mimeTypeGuesser'])
        ) {
            foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS'][\TYPO3\CMS\Core\Type\File\FileInfo::class]['mimeTypeGuesser'] as $mimeTypeGuesser) {
                $hookParameters = array(
                    'mimeType' => &$mimeType
                );

                \TYPO3\CMS\Core\Utility\GeneralUtility::callUserFunction(
                    $mimeTypeGuesser,
                    $hookParameters,
                    $this
                );
            }
        }

        return $mimeType;
    }
}