ObjFW  Diff

- (OFSeekableStream *)archive: (OFZIPArchive *)archive
	    wantsPartNumbered: (unsigned int)partNumber
	       lastPartNumber: (unsigned int)lastPartNumber
{
	OFIRI *IRI;

	if ([_archiveIRI.path.pathExtension caseInsensitiveCompare: @"zip"] !=
	if ([_archiveIRI.pathExtension caseInsensitiveCompare: @"zip"] !=
	    OFOrderedSame)
		return nil;

	if (partNumber > 98)
		return nil;

	if (partNumber == lastPartNumber)
		IRI = _archiveIRI;
	else {
		OFMutableIRI *copy = [[_archiveIRI mutableCopy] autorelease];
		[copy deletePathExtension];
		[copy appendPathExtension: [OFString
		    stringWithFormat: @".z%02u", partNumber + 1]];
		    stringWithFormat: @"z%02u", partNumber + 1]];
		[copy makeImmutable];
		IRI = copy;
	}

	return (OFSeekableStream *)[OFIRIHandler openItemAtIRI: IRI mode: @"r"];
}