Can I Resize A FreeBSD Partition Without losing Data?

[GRF .]

I started to play with WINE and realized I need more space on my FAT32 
partition.  I don't want to re-install FreeBSD.  Is there a tool like 
Partion Magic which will change the size of the FreeBSD filesystem without 
losing data?  I dont care if it runs In Windows or FreeBSD or if it will 
only resize the FreeBSD slice and then I have to use a second tool like 
Partition Magic to resize the FAT32 partition.  I just don't want to 
reinstall FreeBSD.  Is there a solution to my problem?