list( $chunk, $length ) = $this->readChunk( $file );
if ( $chunk != 'INFO' ) {
wfDebug( __METHOD__ . ": expected INFO chunk, got '$chunk'\n" );
list( $chunk, $length ) = $this->readChunk( $file );
if ( $chunk != 'INFO' ) {
wfDebug( __METHOD__ . ": expected INFO chunk, got '$chunk'\n" );