When unzipping large archives, the footprint of -[ZipArchive UnzipFileTo:overwrite:] can become very large, because there are autoreleased objects created for each individual file during the unzip. These don't get released until after the call returns, when the autorelease pool is next drained.

To fix the problem, add another pool inside the do{}while in -[ZipArchive UnzipFileTo:overwrite:] :

do{
    NSAutoreleasePool *internalPool = [[NSAutoreleasePool alloc] init];

    if( [_password length]==0 )

... ret = unzGoToNextFile( _unzFile );

    [internalPool drain];
}while( ret==UNZ_OK && UNZ_OK!=UNZ_END_OF_LIST_OF_FILE );

Yes! I encountered this problem myself and joined the project to add a fix for this, among other things. Thank you for submitting this issue~

Issue 10 has been merged into this issue.

Has this fix been rolled into the source? If not, any chance I can get this fix? We are running into this ourselves and this fix would help us greatly.

Thanks!