Cube  Diff

		@try {
			stream = (OFSeekableStream *)[[OFIRIHandler
			    handlerForIRI:IRI] openItemAtIRI:IRI mode:@"r"];
		} @catch (id e) {
			return false;
		}

		if (![stream isKindOfClass:[OFSeekableStream class]])
		if (![stream isKindOfClass:OFSeekableStream.class])
			return false;

		md2_header header;
		[stream readIntoBuffer:&header exactLength:sizeof(md2_header)];
		endianswap(
		    &header, sizeof(int), sizeof(md2_header) / sizeof(int));