Method category index
Create a subdirectory of the receiver, naming it dirName.
extractMember: anArchiveMember into: temp
Extract the contents of anArchiveMember into a file that resides on disk, and answer the name of the file.
Extract the directory listing from the archive
member: anArchiveMember mode: bits
Set the permission bits for the file in anArchiveMember.
Remove the member represented by anArchiveMember.
Update the member represented by anArchiveMember by copying the file into which it was extracted back to the archive.