766 lines
22 KiB
PHP
766 lines
22 KiB
PHP
<?php
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/** Module defining helper functions for detecting and dealing with mime types.
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*
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*/
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/** Defines a set of well known mime types
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* This is used as a fallback to mime.types files.
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* An extensive list of well known mime types is provided by
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* the file mime.types in the includes directory.
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*/
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define('MM_WELL_KNOWN_MIME_TYPES',<<<END_STRING
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application/ogg ogg ogm
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application/pdf pdf
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application/x-javascript js
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application/x-shockwave-flash swf
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audio/midi mid midi kar
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audio/mpeg mpga mpa mp2 mp3
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audio/x-aiff aif aiff aifc
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audio/x-wav wav
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audio/ogg ogg
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image/x-bmp bmp
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image/gif gif
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image/jpeg jpeg jpg jpe
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image/png png
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image/svg+xml image/svg svg
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image/tiff tiff tif
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image/vnd.djvu image/x.djvu image/x-djvu djvu
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image/x-portable-pixmap ppm
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text/plain txt
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text/html html htm
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video/ogg ogm ogg
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video/mpeg mpg mpeg
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END_STRING
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);
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/** Defines a set of well known mime info entries
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* This is used as a fallback to mime.info files.
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* An extensive list of well known mime types is provided by
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* the file mime.info in the includes directory.
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*/
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define('MM_WELL_KNOWN_MIME_INFO', <<<END_STRING
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application/pdf [OFFICE]
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text/javascript application/x-javascript [EXECUTABLE]
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application/x-shockwave-flash [MULTIMEDIA]
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audio/midi [AUDIO]
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audio/x-aiff [AUDIO]
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audio/x-wav [AUDIO]
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audio/mp3 audio/mpeg [AUDIO]
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application/ogg audio/ogg video/ogg [MULTIMEDIA]
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image/x-bmp image/bmp [BITMAP]
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image/gif [BITMAP]
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image/jpeg [BITMAP]
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image/png [BITMAP]
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image/svg+xml [DRAWING]
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image/tiff [BITMAP]
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image/vnd.djvu [BITMAP]
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image/x-portable-pixmap [BITMAP]
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text/plain [TEXT]
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text/html [TEXT]
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video/ogg [VIDEO]
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video/mpeg [VIDEO]
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unknown/unknown application/octet-stream application/x-empty [UNKNOWN]
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END_STRING
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);
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#note: because this file is possibly included by a function,
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#we need to access the global scope explicitely!
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global $wgLoadFileinfoExtension;
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if ($wgLoadFileinfoExtension) {
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if(!extension_loaded('fileinfo')) dl('fileinfo.' . PHP_SHLIB_SUFFIX);
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}
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/**
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* Implements functions related to mime types such as detection and mapping to
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* file extension.
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*
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* Instances of this class are stateles, there only needs to be one global instance
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* of MimeMagic. Please use MimeMagic::singleton() to get that instance.
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*/
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class MimeMagic {
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/**
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* Mapping of media types to arrays of mime types.
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* This is used by findMediaType and getMediaType, respectively
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*/
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var $mMediaTypes= NULL;
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/** Map of mime type aliases
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*/
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var $mMimeTypeAliases= NULL;
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/** map of mime types to file extensions (as a space seprarated list)
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*/
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var $mMimeToExt= NULL;
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/** map of file extensions types to mime types (as a space seprarated list)
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*/
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var $mExtToMime= NULL;
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/** The singleton instance
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*/
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private static $instance;
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/** Initializes the MimeMagic object. This is called by MimeMagic::singleton().
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*
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* This constructor parses the mime.types and mime.info files and build internal mappings.
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*/
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function __construct() {
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/*
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* --- load mime.types ---
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*/
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global $wgMimeTypeFile, $IP;
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$types = MM_WELL_KNOWN_MIME_TYPES;
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if ( $wgMimeTypeFile == 'includes/mime.types' ) {
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$wgMimeTypeFile = "$IP/$wgMimeTypeFile";
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}
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if ( $wgMimeTypeFile ) {
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if ( is_file( $wgMimeTypeFile ) and is_readable( $wgMimeTypeFile ) ) {
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wfDebug( __METHOD__.": loading mime types from $wgMimeTypeFile\n" );
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$types .= "\n";
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$types .= file_get_contents( $wgMimeTypeFile );
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} else {
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wfDebug( __METHOD__.": can't load mime types from $wgMimeTypeFile\n" );
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}
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} else {
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wfDebug( __METHOD__.": no mime types file defined, using build-ins only.\n" );
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}
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$types = str_replace( array( "\r\n", "\n\r", "\n\n", "\r\r", "\r" ), "\n", $types );
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$types = str_replace( "\t", " ", $types );
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$this->mMimeToExt = array();
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$this->mToMime = array();
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$lines = explode( "\n",$types );
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foreach ( $lines as $s ) {
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$s = trim( $s );
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if ( empty( $s ) ) continue;
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if ( strpos( $s, '#' ) === 0 ) continue;
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$s = strtolower( $s );
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$i = strpos( $s, ' ' );
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if ( $i === false ) continue;
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#print "processing MIME line $s<br>";
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$mime = substr( $s, 0, $i );
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$ext = trim( substr($s, $i+1 ) );
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if ( empty( $ext ) ) continue;
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if ( !empty( $this->mMimeToExt[$mime] ) ) {
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$this->mMimeToExt[$mime] .= ' ' . $ext;
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} else {
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$this->mMimeToExt[$mime] = $ext;
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}
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$extensions = explode( ' ', $ext );
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foreach ( $extensions as $e ) {
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$e = trim( $e );
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if ( empty( $e ) ) continue;
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if ( !empty( $this->mExtToMime[$e] ) ) {
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$this->mExtToMime[$e] .= ' ' . $mime;
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} else {
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$this->mExtToMime[$e] = $mime;
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}
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}
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}
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/*
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* --- load mime.info ---
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*/
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global $wgMimeInfoFile;
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if ( $wgMimeInfoFile == 'includes/mime.info' ) {
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$wgMimeInfoFile = "$IP/$wgMimeInfoFile";
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}
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$info = MM_WELL_KNOWN_MIME_INFO;
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if ( $wgMimeInfoFile ) {
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if ( is_file( $wgMimeInfoFile ) and is_readable( $wgMimeInfoFile ) ) {
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wfDebug( __METHOD__.": loading mime info from $wgMimeInfoFile\n" );
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$info .= "\n";
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$info .= file_get_contents( $wgMimeInfoFile );
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} else {
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wfDebug(__METHOD__.": can't load mime info from $wgMimeInfoFile\n");
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}
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} else {
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wfDebug(__METHOD__.": no mime info file defined, using build-ins only.\n");
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}
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$info = str_replace( array( "\r\n", "\n\r", "\n\n", "\r\r", "\r" ), "\n", $info);
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$info = str_replace( "\t", " ", $info );
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$this->mMimeTypeAliases = array();
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$this->mMediaTypes = array();
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$lines = explode( "\n", $info );
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foreach ( $lines as $s ) {
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$s = trim( $s );
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if ( empty( $s ) ) continue;
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if ( strpos( $s, '#' ) === 0 ) continue;
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$s = strtolower( $s );
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$i = strpos( $s, ' ' );
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if ( $i === false ) continue;
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#print "processing MIME INFO line $s<br>";
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$match = array();
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if ( preg_match( '!\[\s*(\w+)\s*\]!', $s, $match ) ) {
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$s = preg_replace( '!\[\s*(\w+)\s*\]!', '', $s );
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$mtype = trim( strtoupper( $match[1] ) );
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} else {
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$mtype = MEDIATYPE_UNKNOWN;
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}
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$m = explode( ' ', $s );
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if ( !isset( $this->mMediaTypes[$mtype] ) ) {
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$this->mMediaTypes[$mtype] = array();
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}
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foreach ( $m as $mime ) {
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$mime = trim( $mime );
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if ( empty( $mime ) ) continue;
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$this->mMediaTypes[$mtype][] = $mime;
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}
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if ( sizeof( $m ) > 1 ) {
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$main = $m[0];
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for ( $i=1; $i<sizeof($m); $i += 1 ) {
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$mime = $m[$i];
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$this->mMimeTypeAliases[$mime] = $main;
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}
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}
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}
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}
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/**
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* Get an instance of this class
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*/
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static function &singleton() {
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if ( !isset( self::$instance ) ) {
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self::$instance = new MimeMagic;
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}
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return self::$instance;
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}
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/** returns a list of file extensions for a given mime type
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* as a space separated string.
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*/
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function getExtensionsForType( $mime ) {
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$mime = strtolower( $mime );
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$r = @$this->mMimeToExt[$mime];
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if ( @!$r and isset( $this->mMimeTypeAliases[$mime] ) ) {
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$mime = $this->mMimeTypeAliases[$mime];
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$r = @$this->mMimeToExt[$mime];
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}
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return $r;
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}
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/** returns a list of mime types for a given file extension
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* as a space separated string.
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*/
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function getTypesForExtension( $ext ) {
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$ext = strtolower( $ext );
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$r = isset( $this->mExtToMime[$ext] ) ? $this->mExtToMime[$ext] : null;
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return $r;
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}
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/** returns a single mime type for a given file extension.
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* This is always the first type from the list returned by getTypesForExtension($ext).
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*/
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function guessTypesForExtension( $ext ) {
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$m = $this->getTypesForExtension( $ext );
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if ( is_null( $m ) ) return NULL;
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$m = trim( $m );
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$m = preg_replace( '/\s.*$/', '', $m );
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return $m;
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}
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/** tests if the extension matches the given mime type.
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* returns true if a match was found, NULL if the mime type is unknown,
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* and false if the mime type is known but no matches where found.
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*/
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function isMatchingExtension( $extension, $mime ) {
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$ext = $this->getExtensionsForType( $mime );
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if ( !$ext ) {
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return NULL; //unknown
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}
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$ext = explode( ' ', $ext );
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$extension = strtolower( $extension );
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if ( in_array( $extension, $ext ) ) {
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return true;
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}
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return false;
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}
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/** returns true if the mime type is known to represent
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* an image format supported by the PHP GD library.
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*/
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function isPHPImageType( $mime ) {
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#as defined by imagegetsize and image_type_to_mime
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static $types = array(
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'image/gif', 'image/jpeg', 'image/png',
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'image/x-bmp', 'image/xbm', 'image/tiff',
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'image/jp2', 'image/jpeg2000', 'image/iff',
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'image/xbm', 'image/x-xbitmap',
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'image/vnd.wap.wbmp', 'image/vnd.xiff',
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'image/x-photoshop',
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'application/x-shockwave-flash',
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);
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return in_array( $mime, $types );
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}
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/**
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* Returns true if the extension represents a type which can
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* be reliably detected from its content. Use this to determine
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* whether strict content checks should be applied to reject
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* invalid uploads; if we can't identify the type we won't
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* be able to say if it's invalid.
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*
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* @todo Be more accurate when using fancy mime detector plugins;
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* right now this is the bare minimum getimagesize() list.
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* @return bool
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*/
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function isRecognizableExtension( $extension ) {
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static $types = array(
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'gif', 'jpeg', 'jpg', 'png', 'swf', 'psd',
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'bmp', 'tiff', 'tif', 'jpc', 'jp2',
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'jpx', 'jb2', 'swc', 'iff', 'wbmp',
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'xbm', 'djvu'
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);
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return in_array( strtolower( $extension ), $types );
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}
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/** mime type detection. This uses detectMimeType to detect the mime type of the file,
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* but applies additional checks to determine some well known file formats that may be missed
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* or misinterpreter by the default mime detection (namely xml based formats like XHTML or SVG).
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*
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* @param string $file The file to check
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* @param mixed $ext The file extension, or true to extract it from the filename.
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* Set it to false to ignore the extension.
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*
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* @return string the mime type of $file
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*/
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function guessMimeType( $file, $ext = true ) {
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$mime = $this->detectMimeType( $file, $ext );
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// Read a chunk of the file
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wfSuppressWarnings();
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$f = fopen( $file, "rt" );
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wfRestoreWarnings();
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if( !$f ) return "unknown/unknown";
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$head = fread( $f, 1024 );
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fclose( $f );
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$sub4 = substr( $head, 0, 4 );
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if ( $sub4 == "\x01\x00\x09\x00" || $sub4 == "\xd7\xcd\xc6\x9a" ) {
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// WMF kill kill kill
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// Note that WMF may have a bare header, no magic number.
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// The former of the above two checks is theoretically prone to false positives
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$mime = "application/x-msmetafile";
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}
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if ( strpos( $mime, "text/" ) === 0 || $mime === "application/xml" ) {
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$xml_type = NULL;
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$script_type = NULL;
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/*
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* look for XML formats (XHTML and SVG)
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*/
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if ($mime === "text/sgml" ||
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$mime === "text/plain" ||
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$mime === "text/html" ||
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$mime === "text/xml" ||
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$mime === "application/xml") {
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if ( substr( $head, 0, 5 ) == "<?xml" ) {
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$xml_type = "ASCII";
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} elseif ( substr( $head, 0, 8 ) == "\xef\xbb\xbf<?xml") {
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$xml_type = "UTF-8";
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} elseif ( substr( $head, 0, 10 ) == "\xfe\xff\x00<\x00?\x00x\x00m\x00l" ) {
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$xml_type = "UTF-16BE";
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} elseif ( substr( $head, 0, 10 ) == "\xff\xfe<\x00?\x00x\x00m\x00l\x00") {
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$xml_type = "UTF-16LE";
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}
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if ( $xml_type ) {
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if ( $xml_type !== "UTF-8" && $xml_type !== "ASCII" ) {
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$head = iconv( $xml_type, "ASCII//IGNORE", $head );
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}
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$match = array();
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$doctype = "";
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$tag = "";
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if ( preg_match( '%<!DOCTYPE\s+[\w-]+\s+PUBLIC\s+["'."'".'"](.*?)["'."'".'"].*>%sim',
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$head, $match ) ) {
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$doctype = $match[1];
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}
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if ( preg_match( '%<(\w+).*>%sim', $head, $match ) ) {
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$tag = $match[1];
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}
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#print "<br>ANALYSING $file ($mime): doctype= $doctype; tag= $tag<br>";
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if ( strpos( $doctype, "-//W3C//DTD SVG" ) === 0 ) {
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$mime = "image/svg+xml";
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} elseif ( $tag === "svg" ) {
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$mime = "image/svg+xml";
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} elseif ( strpos( $doctype, "-//W3C//DTD XHTML" ) === 0 ) {
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$mime = "text/html";
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} elseif ( $tag === "html" ) {
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$mime = "text/html";
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}
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}
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}
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/*
|
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* look for shell scripts
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*/
|
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if ( !$xml_type ) {
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$script_type = NULL;
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# detect by shebang
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if ( substr( $head, 0, 2) == "#!" ) {
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$script_type = "ASCII";
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} elseif ( substr( $head, 0, 5) == "\xef\xbb\xbf#!" ) {
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$script_type = "UTF-8";
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} elseif ( substr( $head, 0, 7) == "\xfe\xff\x00#\x00!" ) {
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$script_type = "UTF-16BE";
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} elseif ( substr( $head, 0, 7 ) == "\xff\xfe#\x00!" ) {
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$script_type= "UTF-16LE";
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}
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if ( $script_type ) {
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if ( $script_type !== "UTF-8" && $script_type !== "ASCII") {
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$head = iconv( $script_type, "ASCII//IGNORE", $head);
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}
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$match = array();
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if ( preg_match( '%/?([^\s]+/)(\w+)%', $head, $match ) ) {
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$mime = "application/x-{$match[2]}";
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}
|
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}
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}
|
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|
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/*
|
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* look for PHP
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*/
|
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if( !$xml_type && !$script_type ) {
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if( ( strpos( $head, '<?php' ) !== false ) ||
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( strpos( $head, '<? ' ) !== false ) ||
|
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( strpos( $head, "<?\n" ) !== false ) ||
|
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( strpos( $head, "<?\t" ) !== false ) ||
|
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( strpos( $head, "<?=" ) !== false ) ||
|
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|
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( strpos( $head, "<\x00?\x00p\x00h\x00p" ) !== false ) ||
|
|
( strpos( $head, "<\x00?\x00 " ) !== false ) ||
|
|
( strpos( $head, "<\x00?\x00\n" ) !== false ) ||
|
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( strpos( $head, "<\x00?\x00\t" ) !== false ) ||
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( strpos( $head, "<\x00?\x00=" ) !== false ) ) {
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$mime = "application/x-php";
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}
|
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}
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}
|
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if ( isset( $this->mMimeTypeAliases[$mime] ) ) {
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$mime = $this->mMimeTypeAliases[$mime];
|
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}
|
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|
|
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;
|
|
}
|
|
}
|
|
|
|
|