diff -r 000000000000 -r d970ebf37754 wp/wp-includes/ms-files.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/ms-files.php	Wed Nov 06 03:21:17 2013 +0000
@@ -0,0 +1,82 @@
+<?php
+/**
+ * Multisite upload handler.
+ *
+ * @since 3.0.0
+ *
+ * @package WordPress
+ * @subpackage Multisite
+ */
+
+define( 'SHORTINIT', true );
+require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
+
+if( !is_multisite() )
+	die( 'Multisite support not enabled' );
+
+ms_file_constants();
+
+error_reporting( 0 );
+
+if ( $current_blog->archived == '1' || $current_blog->spam == '1' || $current_blog->deleted == '1' ) {
+	status_header( 404 );
+	die( '404 &#8212; File not found.' );
+}
+
+$file = rtrim( BLOGUPLOADDIR, '/' ) . '/' . str_replace( '..', '', $_GET[ 'file' ] );
+if ( !is_file( $file ) ) {
+	status_header( 404 );
+	die( '404 &#8212; File not found.' );
+}
+
+$mime = wp_check_filetype( $file );
+if( false === $mime[ 'type' ] && function_exists( 'mime_content_type' ) )
+	$mime[ 'type' ] = mime_content_type( $file );
+
+if( $mime[ 'type' ] )
+	$mimetype = $mime[ 'type' ];
+else
+	$mimetype = 'image/' . substr( $file, strrpos( $file, '.' ) + 1 );
+
+header( 'Content-Type: ' . $mimetype ); // always send this
+if ( false === strpos( $_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS' ) )
+	header( 'Content-Length: ' . filesize( $file ) );
+
+// Optional support for X-Sendfile and X-Accel-Redirect
+if ( WPMU_ACCEL_REDIRECT ) {
+	header( 'X-Accel-Redirect: ' . str_replace( WP_CONTENT_DIR, '', $file ) );
+	exit;
+} elseif ( WPMU_SENDFILE ) {
+	header( 'X-Sendfile: ' . $file );
+	exit;
+}
+
+$last_modified = gmdate( 'D, d M Y H:i:s', filemtime( $file ) );
+$etag = '"' . md5( $last_modified ) . '"';
+header( "Last-Modified: $last_modified GMT" );
+header( 'ETag: ' . $etag );
+header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + 100000000 ) . ' GMT' );
+
+// Support for Conditional GET - use stripslashes to avoid formatting.php dependency
+$client_etag = isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) ? stripslashes( $_SERVER['HTTP_IF_NONE_MATCH'] ) : false;
+
+if( ! isset( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) )
+	$_SERVER['HTTP_IF_MODIFIED_SINCE'] = false;
+
+$client_last_modified = trim( $_SERVER['HTTP_IF_MODIFIED_SINCE'] );
+// If string is empty, return 0. If not, attempt to parse into a timestamp
+$client_modified_timestamp = $client_last_modified ? strtotime( $client_last_modified ) : 0;
+
+// Make a timestamp for our most recent modification...
+$modified_timestamp = strtotime($last_modified);
+
+if ( ( $client_last_modified && $client_etag )
+	? ( ( $client_modified_timestamp >= $modified_timestamp) && ( $client_etag == $etag ) )
+	: ( ( $client_modified_timestamp >= $modified_timestamp) || ( $client_etag == $etag ) )
+	) {
+	status_header( 304 );
+	exit;
+}
+
+// If we made it this far, just serve the file
+readfile( $file );