Ticket #42560: ms-files.diff

src/wp-includes/ms-files.php

@@ -56 +56 @@
 header( "Last-Modified: $last_modified GMT" );
 header( 'ETag: ' . $etag );
 header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + 100000000 ) . ' GMT' );
+// Note support for range requests.
+header( 'Accept-Ranges: bytes' );
 
 // 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;
@@ -78 +80 @@
         exit;
 }
 
+// Support for byte-range requests
+// Safari requires this and will not play mp4 files (and possibly others)
+// without it.
+if ( ! empty( $_SERVER['HTTP_RANGE'] ) && preg_match('/^bytes=(\d+)-(\d+)$/i', $_SERVER['HTTP_RANGE'], $m ) ) {
+        $byte_start = (int) $m[1];
+        $byte_end = (int) $m[2];
+        if ( filesize( $file ) - 1 < $byte_end || $byte_end < $byte_start ) {
+                status_header( 416 );
+                die( '416 &#8212; Request Range Not Satisfiable.' );
+        }
+        status_header( 206 );
+        header( 'Content-Range: bytes ' . $byte_start . '-' . $byte_end . '/' . filesize( $file ) );
+        header( 'Content-Length: ' . ($byte_end - $byte_start + 1) );
+
+        // Stream the file in 1kb chunks to avoid overloading PHP memory usage for large files.
+        $handle = fopen( $file, "r" );
+        fseek( $handle, $byte_start );
+        $chunk_position = $byte_start;
+        while ( $chunk_position <= $byte_end && !feof($handle) ) {
+                $chunk_length = min( 1024, $byte_end - $chunk_position + 1 );
+                print fread( $handle, $chunk_length );
+                $chunk_position += 1024;
+                flush();
+        }
+        fclose( $handle );
+        flush();
+        exit;
+}
+
 // If we made it this far, just serve the file
 readfile( $file );
 flush();