mMimeToExt = array();
$this->mToMime = array();
$lines = explode( "\n",$types );
foreach ( $lines as $s ) {
$s = trim( $s );
if ( empty( $s ) ) continue;
if ( strpos( $s, '#' ) === 0 ) continue;
$s = strtolower( $s );
$i = strpos( $s, ' ' );
if ( $i === false ) continue;
#print "processing MIME line $s
";
$mime = substr( $s, 0, $i );
$ext = trim( substr($s, $i+1 ) );
if ( empty( $ext ) ) continue;
if ( !empty( $this->mMimeToExt[$mime] ) ) {
$this->mMimeToExt[$mime] .= ' ' . $ext;
} else {
$this->mMimeToExt[$mime] = $ext;
}
$extensions = explode( ' ', $ext );
foreach ( $extensions as $e ) {
$e = trim( $e );
if ( empty( $e ) ) continue;
if ( !empty( $this->mExtToMime[$e] ) ) {
$this->mExtToMime[$e] .= ' ' . $mime;
} else {
$this->mExtToMime[$e] = $mime;
}
}
}
/*
* --- load mime.info ---
*/
global $wgMimeInfoFile;
if ( $wgMimeInfoFile == 'includes/mime.info' ) {
$wgMimeInfoFile = "$IP/$wgMimeInfoFile";
}
$info = MM_WELL_KNOWN_MIME_INFO;
if ( $wgMimeInfoFile ) {
if ( is_file( $wgMimeInfoFile ) and is_readable( $wgMimeInfoFile ) ) {
wfDebug( __METHOD__.": loading mime info from $wgMimeInfoFile\n" );
$info .= "\n";
$info .= file_get_contents( $wgMimeInfoFile );
} else {
wfDebug(__METHOD__.": can't load mime info from $wgMimeInfoFile\n");
}
} else {
wfDebug(__METHOD__.": no mime info file defined, using build-ins only.\n");
}
$info = str_replace( array( "\r\n", "\n\r", "\n\n", "\r\r", "\r" ), "\n", $info);
$info = str_replace( "\t", " ", $info );
$this->mMimeTypeAliases = array();
$this->mMediaTypes = array();
$lines = explode( "\n", $info );
foreach ( $lines as $s ) {
$s = trim( $s );
if ( empty( $s ) ) continue;
if ( strpos( $s, '#' ) === 0 ) continue;
$s = strtolower( $s );
$i = strpos( $s, ' ' );
if ( $i === false ) continue;
#print "processing MIME INFO line $s
";
$match = array();
if ( preg_match( '!\[\s*(\w+)\s*\]!', $s, $match ) ) {
$s = preg_replace( '!\[\s*(\w+)\s*\]!', '', $s );
$mtype = trim( strtoupper( $match[1] ) );
} else {
$mtype = MEDIATYPE_UNKNOWN;
}
$m = explode( ' ', $s );
if ( !isset( $this->mMediaTypes[$mtype] ) ) {
$this->mMediaTypes[$mtype] = array();
}
foreach ( $m as $mime ) {
$mime = trim( $mime );
if ( empty( $mime ) ) continue;
$this->mMediaTypes[$mtype][] = $mime;
}
if ( sizeof( $m ) > 1 ) {
$main = $m[0];
for ( $i=1; $imMimeTypeAliases[$mime] = $main;
}
}
}
}
/**
* Get an instance of this class
*/
static function &singleton() {
if ( !isset( self::$instance ) ) {
self::$instance = new MimeMagic;
}
return self::$instance;
}
/** returns a list of file extensions for a given mime type
* as a space separated string.
*/
function getExtensionsForType( $mime ) {
$mime = strtolower( $mime );
$r = @$this->mMimeToExt[$mime];
if ( @!$r and isset( $this->mMimeTypeAliases[$mime] ) ) {
$mime = $this->mMimeTypeAliases[$mime];
$r = @$this->mMimeToExt[$mime];
}
return $r;
}
/** returns a list of mime types for a given file extension
* as a space separated string.
*/
function getTypesForExtension( $ext ) {
$ext = strtolower( $ext );
$r = isset( $this->mExtToMime[$ext] ) ? $this->mExtToMime[$ext] : null;
return $r;
}
/** returns a single mime type for a given file extension.
* This is always the first type from the list returned by getTypesForExtension($ext).
*/
function guessTypesForExtension( $ext ) {
$m = $this->getTypesForExtension( $ext );
if ( is_null( $m ) ) return NULL;
$m = trim( $m );
$m = preg_replace( '/\s.*$/', '', $m );
return $m;
}
/** tests if the extension matches the given mime type.
* returns true if a match was found, NULL if the mime type is unknown,
* and false if the mime type is known but no matches where found.
*/
function isMatchingExtension( $extension, $mime ) {
$ext = $this->getExtensionsForType( $mime );
if ( !$ext ) {
return NULL; //unknown
}
$ext = explode( ' ', $ext );
$extension = strtolower( $extension );
if ( in_array( $extension, $ext ) ) {
return true;
}
return false;
}
/** returns true if the mime type is known to represent
* an image format supported by the PHP GD library.
*/
function isPHPImageType( $mime ) {
#as defined by imagegetsize and image_type_to_mime
static $types = array(
'image/gif', 'image/jpeg', 'image/png',
'image/x-bmp', 'image/xbm', 'image/tiff',
'image/jp2', 'image/jpeg2000', 'image/iff',
'image/xbm', 'image/x-xbitmap',
'image/vnd.wap.wbmp', 'image/vnd.xiff',
'image/x-photoshop',
'application/x-shockwave-flash',
);
return in_array( $mime, $types );
}
/**
* Returns true if the extension represents a type which can
* be reliably detected from its content. Use this to determine
* whether strict content checks should be applied to reject
* invalid uploads; if we can't identify the type we won't
* be able to say if it's invalid.
*
* @todo Be more accurate when using fancy mime detector plugins;
* right now this is the bare minimum getimagesize() list.
* @return bool
*/
function isRecognizableExtension( $extension ) {
static $types = array(
'gif', 'jpeg', 'jpg', 'png', 'swf', 'psd',
'bmp', 'tiff', 'tif', 'jpc', 'jp2',
'jpx', 'jb2', 'swc', 'iff', 'wbmp',
'xbm', 'djvu'
);
return in_array( strtolower( $extension ), $types );
}
/** mime type detection. This uses detectMimeType to detect the mime type of the file,
* but applies additional checks to determine some well known file formats that may be missed
* or misinterpreter by the default mime detection (namely xml based formats like XHTML or SVG).
*
* @param string $file The file to check
* @param mixed $ext The file extension, or true to extract it from the filename.
* Set it to false to ignore the extension.
*
* @return string the mime type of $file
*/
function guessMimeType( $file, $ext = true ) {
$mime = $this->detectMimeType( $file, $ext );
// Read a chunk of the file
wfSuppressWarnings();
$f = fopen( $file, "rt" );
wfRestoreWarnings();
if( !$f ) return "unknown/unknown";
$head = fread( $f, 1024 );
fclose( $f );
$sub4 = substr( $head, 0, 4 );
if ( $sub4 == "\x01\x00\x09\x00" || $sub4 == "\xd7\xcd\xc6\x9a" ) {
// WMF kill kill kill
// Note that WMF may have a bare header, no magic number.
// The former of the above two checks is theoretically prone to false positives
$mime = "application/x-msmetafile";
}
if ( strpos( $mime, "text/" ) === 0 || $mime === "application/xml" ) {
$xml_type = NULL;
$script_type = NULL;
/*
* look for XML formats (XHTML and SVG)
*/
if ($mime === "text/sgml" ||
$mime === "text/plain" ||
$mime === "text/html" ||
$mime === "text/xml" ||
$mime === "application/xml") {
if ( substr( $head, 0, 5 ) == "%sim',
$head, $match ) ) {
$doctype = $match[1];
}
if ( preg_match( '%<(\w+).*>%sim', $head, $match ) ) {
$tag = $match[1];
}
#print "
ANALYSING $file ($mime): doctype= $doctype; tag= $tag
";
if ( strpos( $doctype, "-//W3C//DTD SVG" ) === 0 ) {
$mime = "image/svg+xml";
} elseif ( $tag === "svg" ) {
$mime = "image/svg+xml";
} elseif ( strpos( $doctype, "-//W3C//DTD XHTML" ) === 0 ) {
$mime = "text/html";
} elseif ( $tag === "html" ) {
$mime = "text/html";
}
}
}
/*
* look for shell scripts
*/
if ( !$xml_type ) {
$script_type = NULL;
# detect by shebang
if ( substr( $head, 0, 2) == "#!" ) {
$script_type = "ASCII";
} elseif ( substr( $head, 0, 5) == "\xef\xbb\xbf#!" ) {
$script_type = "UTF-8";
} elseif ( substr( $head, 0, 7) == "\xfe\xff\x00#\x00!" ) {
$script_type = "UTF-16BE";
} elseif ( substr( $head, 0, 7 ) == "\xff\xfe#\x00!" ) {
$script_type= "UTF-16LE";
}
if ( $script_type ) {
if ( $script_type !== "UTF-8" && $script_type !== "ASCII") {
$head = iconv( $script_type, "ASCII//IGNORE", $head);
}
$match = array();
if ( preg_match( '%/?([^\s]+/)(\w+)%', $head, $match ) ) {
$mime = "application/x-{$match[2]}";
}
}
}
/*
* look for PHP
*/
if( !$xml_type && !$script_type ) {
if( ( strpos( $head, 'mMimeTypeAliases[$mime] ) ) {
$mime = $this->mMimeTypeAliases[$mime];
}
wfDebug(__METHOD__.": final mime type of $file: $mime\n");
return $mime;
}
/** Internal mime type detection, please use guessMimeType() for application code instead.
* Detection is done using an external program, if $wgMimeDetectorCommand is set.
* Otherwise, the fileinfo extension and mime_content_type are tried (in this order), if they are available.
* If the dections fails and $ext is not false, the mime type is guessed from the file extension, using
* guessTypesForExtension.
* If the mime type is still unknown, getimagesize is used to detect the mime type if the file is an image.
* If no mime type can be determined, this function returns "unknown/unknown".
*
* @param string $file The file to check
* @param mixed $ext The file extension, or true to extract it from the filename.
* Set it to false to ignore the extension.
*
* @return string the mime type of $file
* @access private
*/
function detectMimeType( $file, $ext = true ) {
global $wgMimeDetectorCommand;
$m = NULL;
if ( $wgMimeDetectorCommand ) {
$fn = wfEscapeShellArg( $file );
$m = `$wgMimeDetectorCommand $fn`;
} elseif ( function_exists( "finfo_open" ) && function_exists( "finfo_file" ) ) {
# This required the fileinfo extension by PECL,
# see http://pecl.php.net/package/fileinfo
# This must be compiled into PHP
#
# finfo is the official replacement for the deprecated
# mime_content_type function, see below.
#
# If you may need to load the fileinfo extension at runtime, set
# $wgLoadFileinfoExtension in LocalSettings.php
$mime_magic_resource = finfo_open(FILEINFO_MIME); /* return mime type ala mimetype extension */
if ($mime_magic_resource) {
$m = finfo_file( $mime_magic_resource, $file );
finfo_close( $mime_magic_resource );
} else {
wfDebug( __METHOD__.": finfo_open failed on ".FILEINFO_MIME."!\n" );
}
} elseif ( function_exists( "mime_content_type" ) ) {
# NOTE: this function is available since PHP 4.3.0, but only if
# PHP was compiled with --with-mime-magic or, before 4.3.2, with --enable-mime-magic.
#
# On Windows, you must set mime_magic.magicfile in php.ini to point to the mime.magic file bundeled with PHP;
# sometimes, this may even be needed under linus/unix.
#
# Also note that this has been DEPRECATED in favor of the fileinfo extension by PECL, see above.
# see http://www.php.net/manual/en/ref.mime-magic.php for details.
$m = mime_content_type($file);
if ( $m == 'text/plain' ) {
// mime_content_type sometimes considers DJVU files to be text/plain.
$deja = new DjVuImage( $file );
if( $deja->isValid() ) {
wfDebug( __METHOD__.": (re)detected $file as image/vnd.djvu\n" );
$m = 'image/vnd.djvu';
}
}
} else {
wfDebug( __METHOD__.": no magic mime detector found!\n" );
}
if ( $m ) {
# normalize
$m = preg_replace( '![;, ].*$!', '', $m ); #strip charset, etc
$m = trim( $m );
$m = strtolower( $m );
if ( strpos( $m, 'unknown' ) !== false ) {
$m = NULL;
} else {
wfDebug( __METHOD__.": magic mime type of $file: $m\n" );
return $m;
}
}
# if still not known, use getimagesize to find out the type of image
# TODO: skip things that do not have a well-known image extension? Would that be safe?
wfSuppressWarnings();
$gis = getimagesize( $file );
wfRestoreWarnings();
$notAnImage = false;
if ( $gis && is_array($gis) && $gis[2] ) {
switch ( $gis[2] ) {
case IMAGETYPE_GIF: $m = "image/gif"; break;
case IMAGETYPE_JPEG: $m = "image/jpeg"; break;
case IMAGETYPE_PNG: $m = "image/png"; break;
case IMAGETYPE_SWF: $m = "application/x-shockwave-flash"; break;
case IMAGETYPE_PSD: $m = "application/photoshop"; break;
case IMAGETYPE_BMP: $m = "image/bmp"; break;
case IMAGETYPE_TIFF_II: $m = "image/tiff"; break;
case IMAGETYPE_TIFF_MM: $m = "image/tiff"; break;
case IMAGETYPE_JPC: $m = "image"; break;
case IMAGETYPE_JP2: $m = "image/jpeg2000"; break;
case IMAGETYPE_JPX: $m = "image/jpeg2000"; break;
case IMAGETYPE_JB2: $m = "image"; break;
case IMAGETYPE_SWC: $m = "application/x-shockwave-flash"; break;
case IMAGETYPE_IFF: $m = "image/vnd.xiff"; break;
case IMAGETYPE_WBMP: $m = "image/vnd.wap.wbmp"; break;
case IMAGETYPE_XBM: $m = "image/x-xbitmap"; break;
}
if ( $m ) {
wfDebug( __METHOD__.": image mime type of $file: $m\n" );
return $m;
}
else {
$notAnImage = true;
}
} else {
// Also test DjVu
$deja = new DjVuImage( $file );
if( $deja->isValid() ) {
wfDebug( __METHOD__.": detected $file as image/vnd.djvu\n" );
return 'image/vnd.djvu';
}
}
# if desired, look at extension as a fallback.
if ( $ext === true ) {
$i = strrpos( $file, '.' );
$ext = strtolower( $i ? substr( $file, $i + 1 ) : '' );
}
if ( $ext ) {
$m = $this->guessTypesForExtension( $ext );
# TODO: if $notAnImage is set, do not trust the file extension if
# the results is one of the image types that should have been recognized
# by getimagesize
if ( $m ) {
wfDebug( __METHOD__.": extension mime type of $file: $m\n" );
return $m;
}
}
#unknown type
wfDebug( __METHOD__.": failed to guess mime type for $file!\n" );
return "unknown/unknown";
}
/**
* Determine the media type code for a file, using its mime type, name and possibly
* its contents.
*
* This function relies on the findMediaType(), mapping extensions and mime
* types to media types.
*
* @todo analyse file if need be
* @todo look at multiple extension, separately and together.
*
* @param string $path full path to the image file, in case we have to look at the contents
* (if null, only the mime type is used to determine the media type code).
* @param string $mime mime type. If null it will be guessed using guessMimeType.
*
* @return (int?string?) a value to be used with the MEDIATYPE_xxx constants.
*/
function getMediaType( $path = NULL, $mime = NULL ) {
if( !$mime && !$path ) return MEDIATYPE_UNKNOWN;
# If mime type is unknown, guess it
if( !$mime ) $mime = $this->guessMimeType( $path, false );
# Special code for ogg - detect if it's video (theora),
# else label it as sound.
if( $mime == "application/ogg" && file_exists( $path ) ) {
// Read a chunk of the file
$f = fopen( $path, "rt" );
if ( !$f ) return MEDIATYPE_UNKNOWN;
$head = fread( $f, 256 );
fclose( $f );
$head = strtolower( $head );
# This is an UGLY HACK, file should be parsed correctly
if ( strpos( $head, 'theora' ) !== false ) return MEDIATYPE_VIDEO;
elseif ( strpos( $head, 'vorbis' ) !== false ) return MEDIATYPE_AUDIO;
elseif ( strpos( $head, 'flac' ) !== false ) return MEDIATYPE_AUDIO;
elseif ( strpos( $head, 'speex' ) !== false ) return MEDIATYPE_AUDIO;
else return MEDIATYPE_MULTIMEDIA;
}
# check for entry for full mime type
if( $mime ) {
$type = $this->findMediaType( $mime );
if( $type !== MEDIATYPE_UNKNOWN ) return $type;
}
# Check for entry for file extension
$e = NULL;
if ( $path ) {
$i = strrpos( $path, '.' );
$e = strtolower( $i ? substr( $path, $i + 1 ) : '' );
# TODO: look at multi-extension if this fails, parse from full path
$type = $this->findMediaType( '.' . $e );
if ( $type !== MEDIATYPE_UNKNOWN ) return $type;
}
# Check major mime type
if( $mime ) {
$i = strpos( $mime, '/' );
if( $i !== false ) {
$major = substr( $mime, 0, $i );
$type = $this->findMediaType( $major );
if( $type !== MEDIATYPE_UNKNOWN ) return $type;
}
}
if( !$type ) $type = MEDIATYPE_UNKNOWN;
return $type;
}
/** returns a media code matching the given mime type or file extension.
* File extensions are represented by a string starting with a dot (.) to
* distinguish them from mime types.
*
* This funktion relies on the mapping defined by $this->mMediaTypes
* @access private
*/
function findMediaType( $extMime ) {
if ( strpos( $extMime, '.' ) === 0 ) { #if it's an extension, look up the mime types
$m = $this->getTypesForExtension( substr( $extMime, 1 ) );
if ( !$m ) return MEDIATYPE_UNKNOWN;
$m = explode( ' ', $m );
} else {
# Normalize mime type
if ( isset( $this->mMimeTypeAliases[$extMime] ) ) {
$extMime = $this->mMimeTypeAliases[$extMime];
}
$m = array($extMime);
}
foreach ( $m as $mime ) {
foreach ( $this->mMediaTypes as $type => $codes ) {
if ( in_array($mime, $codes, true ) ) {
return $type;
}
}
}
return MEDIATYPE_UNKNOWN;
}
}