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<?php

namespace GuzzleHttp\Psr7;

final class
MimeType
{
   
/**
     * Determines the mimetype of a file by looking at its extension.
     *
     * @param string $filename
     *
     * @return string|null
     */
   
public static function fromFilename($filename)
    {
        return
self::fromExtension(pathinfo($filename, PATHINFO_EXTENSION));
    }

   
/**
     * Maps a file extensions to a mimetype.
     *
     * @param string $extension string The file extension.
     *
     * @return string|null
     *
     * @link http://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x/conf/mime.types
     */
   
public static function fromExtension($extension)
    {
        static
$mimetypes = [
           
'3gp' => 'video/3gpp',
           
'7z' => 'application/x-7z-compressed',
           
'aac' => 'audio/x-aac',
           
'ai' => 'application/postscript',
           
'aif' => 'audio/x-aiff',
           
'asc' => 'text/plain',
           
'asf' => 'video/x-ms-asf',
           
'atom' => 'application/atom+xml',
           
'avi' => 'video/x-msvideo',
           
'bmp' => 'image/bmp',
           
'bz2' => 'application/x-bzip2',
           
'cer' => 'application/pkix-cert',
           
'crl' => 'application/pkix-crl',
           
'crt' => 'application/x-x509-ca-cert',
           
'css' => 'text/css',
           
'csv' => 'text/csv',
           
'cu' => 'application/cu-seeme',
           
'deb' => 'application/x-debian-package',
           
'doc' => 'application/msword',
           
'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
           
'dvi' => 'application/x-dvi',
           
'eot' => 'application/vnd.ms-fontobject',
           
'eps' => 'application/postscript',
           
'epub' => 'application/epub+zip',
           
'etx' => 'text/x-setext',
           
'flac' => 'audio/flac',
           
'flv' => 'video/x-flv',
           
'gif' => 'image/gif',
           
'gz' => 'application/gzip',
           
'htm' => 'text/html',
           
'html' => 'text/html',
           
'ico' => 'image/x-icon',
           
'ics' => 'text/calendar',
           
'ini' => 'text/plain',
           
'iso' => 'application/x-iso9660-image',
           
'jar' => 'application/java-archive',
           
'jpe' => 'image/jpeg',
           
'jpeg' => 'image/jpeg',
           
'jpg' => 'image/jpeg',
           
'js' => 'text/javascript',
           
'json' => 'application/json',
           
'latex' => 'application/x-latex',
           
'log' => 'text/plain',
           
'm4a' => 'audio/mp4',
           
'm4v' => 'video/mp4',
           
'mid' => 'audio/midi',
           
'midi' => 'audio/midi',
           
'mov' => 'video/quicktime',
           
'mkv' => 'video/x-matroska',
           
'mp3' => 'audio/mpeg',
           
'mp4' => 'video/mp4',
           
'mp4a' => 'audio/mp4',
           
'mp4v' => 'video/mp4',
           
'mpe' => 'video/mpeg',
           
'mpeg' => 'video/mpeg',
           
'mpg' => 'video/mpeg',
           
'mpg4' => 'video/mp4',
           
'oga' => 'audio/ogg',
           
'ogg' => 'audio/ogg',
           
'ogv' => 'video/ogg',
           
'ogx' => 'application/ogg',
           
'pbm' => 'image/x-portable-bitmap',
           
'pdf' => 'application/pdf',
           
'pgm' => 'image/x-portable-graymap',
           
'png' => 'image/png',
           
'pnm' => 'image/x-portable-anymap',
           
'ppm' => 'image/x-portable-pixmap',
           
'ppt' => 'application/vnd.ms-powerpoint',
           
'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
           
'ps' => 'application/postscript',
           
'qt' => 'video/quicktime',
           
'rar' => 'application/x-rar-compressed',
           
'ras' => 'image/x-cmu-raster',
           
'rss' => 'application/rss+xml',
           
'rtf' => 'application/rtf',
           
'sgm' => 'text/sgml',
           
'sgml' => 'text/sgml',
           
'svg' => 'image/svg+xml',
           
'swf' => 'application/x-shockwave-flash',
           
'tar' => 'application/x-tar',
           
'tif' => 'image/tiff',
           
'tiff' => 'image/tiff',
           
'torrent' => 'application/x-bittorrent',
           
'ttf' => 'application/x-font-ttf',
           
'txt' => 'text/plain',
           
'wav' => 'audio/x-wav',
           
'webm' => 'video/webm',
           
'webp' => 'image/webp',
           
'wma' => 'audio/x-ms-wma',
           
'wmv' => 'video/x-ms-wmv',
           
'woff' => 'application/x-font-woff',
           
'wsdl' => 'application/wsdl+xml',
           
'xbm' => 'image/x-xbitmap',
           
'xls' => 'application/vnd.ms-excel',
           
'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
           
'xml' => 'application/xml',
           
'xpm' => 'image/x-xpixmap',
           
'xwd' => 'image/x-xwindowdump',
           
'yaml' => 'text/yaml',
           
'yml' => 'text/yaml',
           
'zip' => 'application/zip',
        ];

       
$extension = strtolower($extension);

        return isset(
$mimetypes[$extension])
            ?
$mimetypes[$extension]
            :
null;
    }
}